👥 Interview: False Positives for Adrenal Insufficiency

– AI false positives pose serious danger to patients; cutoff changes recommended

by Scott Harris , Contributing Writer, MedPage Today November 15, 2021

This Reading Room is a collaboration between MedPage Today® and:

Medpage Today

For adrenal insufficiency (AI), reducing false positives means more than reducing resource utilization. Treatments like glucocorticoid replacement therapy can cause serious harm in people who do not actually have AI.

Research published in the Journal of the Endocrine Society makes multiple findings that report authors say could help bring down false positive rates for AI. This retrospective study ultimately analyzed 6,531 medical records from the Imperial College Healthcare NHS Trust in the United Kingdom.

Sirazum Choudhury, MBBS, an endocrinologist-researcher with the trust, served as a co-author of the report. He discussed the study with MedPage Today. The exchange has been edited for length and clarity.

This study ultimately addressed two related but distinct questions. What was the first?

Choudhury: Initially the path we were following had to do with when cortisol levels are tested.

Cortisol levels follow a diurnal pattern; levels are highest in the morning and then decline to almost nothing overnight. This means we ought to be measuring the level in the morning. But there are logistical issues to doing so. In many hospitals, we end up taking measurements of cortisol in the afternoon. That creates a dilemma, because if it comes back low, there’s an issue as to what we ought to do with the result.

Here at Imperial, we call out results of <100 nmol/L among those taken in the afternoon. Patients and doctors then have to deal with these abnormal results, when in fact they may not actually be abnormal. We may be investigating individuals who should really not be investigated.

So the first aim of our study was to try and ascertain whether we could bring that down to a lower level and in doing so stop erroneously capturing people who are actually fine.

What was the second aim of the study?

Choudhury: As we went through tens of thousands of data sets, we realized we could answer more than that one simple question. So the next part of the study became: if an individual is identified as suspicious for AI, what’s the best way to prove this diagnosis?

We do this with different tests like short Synacthen Tests (SST), all with different cutoff points. Obviously, we want to get the testing right, because if you falsely label a person as having AI, the upshot is that treatments will interfere with their cortisol access and they will not do well. Simply put, we would be shortening their life.

So, our second goal was to look at all the SSTs we’ve done at the center and track them to see whether we could do better with the benchmarks.

What did you find?

Choudhury: When you look at the data, you see that you can bring those benchmarks down and potentially create a more accurate test.

First, we can be quite sure that a patient who is tested in the afternoon and whose cortisol level is >234 does not have AI. If their level is <53.5 then further investigation is needed

There were similar findings for SSTs, which in our case were processed using a platform made by Abbott. For this platform, we concluded that the existing cut-offs should be dropped down to 367 at 30 minutes or 419 at about 60 minutes.

Did anything surprise you about the study or its findings?

Choudhury: If you look at the literature, the number of individuals who fail at 30 minutes but pass at 60 minutes is around 5%. But I was very surprised to see that our number at Imperial was about 20%.

This is a key issue because, as I mentioned, if individuals are wrongly labelled adrenally insufficient, you’re shortening their life. It’s scary to think about the number of people who might have been given steroids and treated for AI when they didn’t have the condition.

What do you see as the next steps?

Choudhury: I see centers unifying their cutoffs for SST results and making sure we’re all consistent in the way we treat these results.

From a research perspective, on the testing we’re obviously talking about one specific platform with Abbott, so research needs to be done on SST analyzers from other manufacturers to work out what their specific cutoffs should be.

Read the study here and expert commentary on the clinical implications here.

The study authors did not disclose any relevant relationship with industry.

ℹ️ Basics: What is Cortisol?

Cortisol is a hormone which produced by the adrenal gland (cortex) to control blood sugar. The production of cortisol is triggered by the pituitary hormone ACTH. Cortisol is a glucocorticoid which stimulates an increase in blood glucose. Cortisol will also stimulate the release of amino acids from muscle tissue and fatty acids from adipose tissue. The amino acids are then converted in the liver to glucose (for use by the brain). The fatty acids can be used by skeletal muscles for energy (rather than glucose) thereby freeing up glucose for selective utilization by the brain. Cortisol levels are often measured to evaluate the function of the pituitary or adrenal glands. Some of the cortisol is metabolized by the liver to produce 17 hydroxycorticosteroids, which is then excreted in the urine.

The primary stress hormone. Cortisol is the major natural GLUCOCORTICOID (GC) in humans.

Synthetic cortisol, also known as hydrocortisone, is used as a drug mainly to fight allergies and inflammation.

Physiology
The amount of cortisol present in the serum undergoes diurnal variation, with the highest levels present in the early morning, and lower levels in the evening, several hours after the onset of sleep. Information about the light/dark cycle is transmitted from the retina to the paired suprachiasmatic nuclei in the hypothalamus. Changed patterns of the serum cortisol levels have been observed in connection with abnormal ACTH levels, clinical depression, psychological stress, and such physiological stressors as hypoglycemia, illness, fever, trauma, surgery, fear, pain, physical exertion or extremes of temperature. There is also significant individual variation, although a given person tends to have consistent rhythms.

Cortisol also inhibits the secretion of corticotropin releasing hormone (CRH), resulting in feedback inhibition of ACTH secretion. Some researchers believe that this normal feedback system may break down when animals are exposed to chronic stress.

In normal release, cortisol has widespread actions which help restore homeostasis after stress. It acts as a physiological antagonist to insulin by promoting gluconeogenesis, breakdown of lipids, and proteins, and mobilization of extrahepatic amino acids and ketone bodies. This leads to increased blood glucose concentrations, resulting in increased glycogen formation in the liver (Freeman, 2002). It also increases blood pressure. In addition, immune and inflammatory cells have their responses to stress attenuated by cortisol, and the hormone thus lowers the activity of the immune system. Bone formation is also lowered by cortisol.

These normal endogenous functions are the basis for the physiological consequences of chronic stress – prolonged cortisol secretion causes muscle wastage, hyperglycemia, and suppresses immune / inflammatory responses. The same consequences arise from long-term use of glucocorticoid drugs.

Also, long-term exposure to cortisol results in damage to cells in the hippocampus. This damage results in impaired learning. However, short-term exposure of cortisol helps to create memories; this is the proposed mechanism for storage of flash bulb memories.

Pharmacology
As an oral or injectable drug, cortisol is also known as hydrocortisone. It is used as an immunosuppressive drug, given by injection in the treatment of severe allergic reactions such as anaphylaxis and angioedema, in place of prednisolone in patients who need steroid treatment but cannot take oral medication, and peri-operatively in patients on long-term steroid treatment to prevent an Addisonian crisis.

It is given by topical application for its anti-inflammatory effect in allergic rashes, eczema and certain other inflammatory conditions. It may also be injected into inflamed joints resulting from diseases such as gout.

Compared to prednisolone, hydrocortisone is about 1/4th the strength. Dexamethasone is about 40 times stronger than hydrocortisone. For side effects, see corticosteroid and prednisolone.

A certain amount of cortisol is necessary for life. Without cortisol even a small amount of stress will kill you. Addison’s disease is a disease which causes low cortisol levels, and which is treated by cortisol replacement therapy.

Cortisol…

  • helps maintain blood pressure and cardiovascular function;
  • helps slow the immune system’s inflammatory response;
  • helps balance the effects of insulin in breaking down sugar for energy; and
  • helps regulate the metabolism of proteins, carbohydrates, and fats.

 

⁉️ Myth: Even Though You Are Chronically Ill, You Should Have The Same Amount Of Energy Every Day…

Myth: Even though you are chronically ill, you should have the same amount of energy every day. “You look SO good and you went to that party last month! Why can’t you come to MY party?!” When you say you are not well enough to do something, you are just making excuses. You could do it, just like you did that other thing; you are just choosing not to!

myth-busted

Fact: You may have heard me talk about “The Spoon Theory”. It was created by someone named Christine Miserandino, to explain the experience of someone with chronic illness in terms of using energy to live and to complete tasks every day. Though the myth assumes that one should have the same amount of energy all the time; the fact is that energy levels fluctuate and people who are chronically ill must make conscious decisions about what they can spend their energy on.

Christine Miserandino (2010) uses the spoon theory to answer the question, “What does it feel like to be sick?” The spoons serve as a symbol for resources available and energy spent to get through every moment of every day. Miserandino states that “The difference in being sick and being healthy is having to make choices or to consciously think about things when the rest of the world doesn’t have to”. Most people who get sick feel a loss of a life they once knew. When you are healthy, you expect to have a never ending supply of spoons. But, when you are not well, you need to count your spoons to keep track and you can never forget about it or take it for granted. Each task costs a spoon and each spoon is not to be taken for granted. Miserandino (2010) asks, “Do you know how many spoons people waste every day?”

Patients use the metaphor of a banking system. In this system, patients must make a withdrawal of a spoon every time they complete a task. Cushing’s and Adrenal Insufficiency patients talk about the “Cortisol Bank” metaphor. The concept is the same and the idea is that certain stressors and/or tasks cause one’s body to make a cortisol withdrawal from the body. Bad things happen when there is a cortisol deficit, meaning that there is not enough cortisol in the body for one to live everyday because of the amount of cortisol that has already been used up. If a person continues to draw from the bank on an account that is already negative, the situation can become worse and worse as each day passes.

Something needs to happen in order to start making appropriate deposits. This can include, taking more medication (stress dosing or an emergency shot), resting, getting adequate physical and emotional support and help, and saying “NO!”. Even when in a deficit, many patients have a difficult time saying “no” to an invitation to an event, completing a task, or engaging someone in a way that will use up more energy because of their fear of their loved one’s reactions. Much of the time, this fear is warranted because of the actual reactions they have received. Ever heard, “But you volunteered for the bake sale last week! You must be better! Why can’t you come to church this week?!”. You may have heard something similar.

It is important for loved ones to understand the amount of “spoons” it takes for a chronically ill person just to get through every single day. EVERYTHING costs spoons! The amount of spoons paid by each person varies from person to person. It all depends on that individual’s situation, body, level of illness, etc. What is common for all, though, is that spoons must be used and eventually those spoons run out. In order to avoid becoming sick or to recuperate from getting sick, the chronically ill patient must evaluate how he/she will use spoons and what tasks can be feasibly completed that day or week. Please understand that when the chronically ill patient says, “YES” to you; he/she is making a conscious choice to use up spoons to meet your need, request, or demand. Talking on the phone, going out to lunch, making dinner, coming to your event all required a sacrifice of another task that day or week. Your friend may have come to lunch with you but that required that she skipped washing the dishes that day or washing her hair, or is even giving up doing something important the next day. Instead of being angry at your friend, please consider why the request is denied at times.

spoons-mythsRefer to the attached picture. This is not an exact science but gives some idea of the spoon bank. If you have time, try doing this exercise: Lay out 8-12 physical spoons. As you complete certain tasks throughout the day, use this chart to subtract spoons from your pile.

Each and every thing requires a spoon. Taking a shower, washing your hair, cooking, cleaning, watching a movie, going out to lunch, working, writing this post (Ha)! When you are done with your day, notice how many spoons you have left. Observe your feelings after this exercise. You can even do it for a week. Lay out a certain amount of spoons for every day for seven days. If you go into a deficit, borrow spoons from the following day. However, if you do borrow spoons; you must take away a task that you WERE planning to originally do that day. Notice what happens and notice how you feel at the end of the week.

You can view “The Spoon Theory” in its entirety at: http://www.butyoudontlooksick.com/articles/written-by-christine/the-spoon-theory/

Can you think of any other tasks that are not on this chart? Help our friends who are doing the activity. List those tasks and assign how many spoons each task will require.
Spoon Bank
Get out of bed- 1 Spoon
Shower- 2 Spoons
Attend Special Event- 5 Spoons
Go out for Coffee- 4 Spoons
Drive- 4 Spoons
Make a Phone Call- 3 Spoons
Work- 5 spoons
Play Games-3 Spoons
Clean the House- 5 Spoons
Have a Meal- 2 Spoons
Walk the Dog- 4 Spoons
Study- 5 Spoons
Watch TV- 3 Spoons
Ironing- 5 Spoons
Exercise- 4 Spoons
Shopping- 4 Spoons
Read- 2 Spoons
Catch Public Transport- 4 Spoons
Cook- 4 Spoons

 

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Basics: What Causes Abnormal Cortisol Levels?

 

Cortisol isn’t bad; you need it to help regulate your responses to life. Regulation involves a very complex interplay of feedback loops between the hypothalamus, pituitary gland, and adrenal glands, says Dr. Singh.

“In general, cortisol levels tend to peak in the late morning and gradually decline throughout the day,” he explains. “When a stressful event occurs, the increased cortisol will work alongside our ‘fight or flight’ mechanisms to either upregulate or downregulate bodily functions. [Affected systems include] the central nervous system, cardiovascular system, gastrointestinal system, or immune system.”

In addition to normal processes that trigger or suppress cortisol release, levels can also be affected by different medical conditions, Dr. Singh says. For example, if someone has abnormally high levels of cortisol, this is called Cushing’s syndrome, which is typically caused by a tumor affecting any of the glands that take part in the process of cortisol production.

When people suffer from abnormally low levels of cortisol, it’s called Addison’s disease. It generally occurs due to adrenal gland dysfunction, but could also be the result of abnormal functioning of any of the other glands in the cortisol production process.

Finally, if you use corticosteroid medications such as prednisone or dexamethasone, prolonged use will result in excessive cortisol production, Dr. Singh says.

“If the medication is not adequately tapered down when discontinued, the body’s ability to create cortisol can become permanently impaired,” he says.

From https://www.yahoo.com/lifestyle/manage-pesky-stress-hormone-cortisol-184900397.html

 

How Cushing’s has broken my body

It isn’t April anymore, but 2014 week’s events have inspired another post by Catherine trying to explain a few specific limitations and misunderstandings:

From http://muskegfarm.blogspot.com/2014/05/how-cushings-has-broken-my-body.html

 

I was planning to take a decent break after the whole “post every day in April for Cushing’s Awareness Month” thing, but I somehow woke up knowing I needed to get this thought (and information) out there…

When my exhaustion comes up or people are around me a while, I continue to be told/asked things like:
“Have you tried walking?”
“If you did a little extra each day, you’d build muscle.”
“Stress hormones are the problem?  Well, stop stressing!”
“I know you’re tired, but if you don’t exercise, you’ll lose muscle and gain weight.”
“Are you counting calories?  Not doing much, no wonder you’re gaining weight.”

I know these questions stem from ignorance about the disease and some people really are wanting to be helpful.  But it really is counter-intuitive, I’m not making that up. And when people feel the need to say these things to me it still hurts my feelings a bit even when I remember that.  It just reminds me that they haven’t learned the basics about my disease, and it still feels as though they are blaming my symptoms on me again…like I’m a fat, lazy, idiot.

Who doesn’t know you exercise to maintain and gain muscle?  That you lose it if you don’t use it?  That eating too much (or incorrectly) causes weight gain?  That in healthy people, expending energy in the form of exercise can actually increase your overall energy in the long-run?

Seriously, my body is broken.  These “normal” systems just don’t work.

Cushing’s causes the demineralization of bones.  Cushies break bones very easily.  Ever heard of someone waking up to a broken ankle with no trauma?  Yep.  Breaking ribs just rolling over in bed?  That too.  Imagine that isn’t an 80 year old, but a 35 or 45 year old.  We develop osteopenia and osteoporosis as part of the disease process, and sometimes that is the first time doctors take notice that something abnormal is going on in our bodies.  I have a friend who is paralyzed because of broken vertebrae thanks to this disease.  It’s horrible.  And it isn’t his fault.

Now, imagine that your body also metabolizes your own muscles.  Really.  No amount of exercise can stop that, only curing the disease can…and then you have the long, daunting task of trying to rebuild amidst pain, exhaustion, and weakness.  I have a supplement that *might* help SLOW it but cannot stop it.  This is why people with my disease tend to have skinny arms and legs.  The first muscles to go (dramatically, anyway) are the quads and biceps.  It becomes difficult/impossible to walk up stairs, to stand unassisted from a squat or to get up from a seated position without using your arms.  And as far as the biceps go, one of the first things people notice is the inability to open lids…that requires your upper arm muscles more than you’d think.  As an example, I can’t open about every 3rd Gatorade lid these days.  It is absurd!  Something so simple, and I can’t do it.  And trust me, I open those bottles multiple times a day, every day, yet I am still losing that ability.  (I NEED the salt to raise my BP due to the lack of another hormone, that’s a diagnosed need and I will die of dehydration without it, so don’t even go there; I’ve already had that lecture from strangers in Wal-Mart or friends at a dinner table in public.)

At the same time, imagine your disease is CAUSING extreme, uncontrollable weight gain.  That’s one of the most obvious symptoms –it’s not the disease, it’s a SYMPTOM!  It doesn’t matter how many calories you cut or how perfect your diet is, the weight just keeps piling on.  At very best you can maintain (not lose), but even that isn’t possible for most.  It centers around your face (moon facies), your neck (sub-clavicular fat pads, buffalo hump, big chin), and your abdomen.  It is both firm on top (almost hard like a pregnancy belly) and soft on the bottom and hanging down (pendulous abdomen).  You CAN eat low-carb, low-starch, low-sugar to try to slow the onset of diabetes and weight gain, but you cannot stop what the chemicals in your body are doing.  Cortisol is directly involved in blood sugar within the body, and it can be catastrophic when either too high or too low.  For example, I eat roughly the same diet.  It isn’t perfect by ANY means, and I have variations, but in a high I gain between .5-2lbs a day and on that same diet in a low, I lose .25-.5 pounds a day.  It isn’t my diet, it is my cortisol levels…and the highs are outstripping the lows.  I’m in a pattern of slow gain, but it is very disheartening to see.

I mean, we need to use reason here.  If you are able to continue to exercise (strenuous is NOT recommended, I was flat-out told not to do that anymore), obviously it is a good idea to maintain as much muscle mass and strength as you can.  That said, I do NOT gain more energy if I use what I have.  Backwards perhaps, but true.  I don’t get rejuvenation from sleep either…often waking up feeling as tired as when I went to bed (Cushing’s messes up your sleep cycles, if you can get sleep).  Obviously it is wise to eat well, but remember most of us are dead broke with all these medical bills (and healthy food DOES cost more) and in my case, I am unable to cook any more.  I used to cook from scratch and eat a very clean diet, now even the energy to put a frozen meal in the oven, then remove it and dish it up later is too much most days.  We know that eating better is good for our bodies.  But, the reality is that being perfect in these things will not stop the disease nor it’s effects on our bodies.  Even if you mean well, please don’t say things that suggest we could stop it if we just tried harder or made a little change ourselves –it is hurtful and even if you don’t mean to, pushes blame onto us.

Now, I really need to explain the “broken” thing.  Our hormone systems (at least in the pituitary) generally work in feedback loops.  Parts in the brain take in information about our body’s condition, external environment, emotions, etc.  It interprets that information and makes judgments about what our body needs more or less of and sends the appropriate signals to other parts of the body (like the pituitary).  The pituitary then sends out stimulating hormones (in the case of Cushing’s, ACTH – Adrenocorticotropic Hormone) that tell other glands to produce their various hormones for use.  Again, in the case of Cushing’s, ACTH stimulates Cortisol specifically.  When there is sufficient cortisol in the body, it “feeds back” to the brain and pituitary that there is sufficient and the production of ACTH stops/drops.

With Cushing’s, that loop is broken.  Really broken.  There is a tumor getting in the way and throwing everything off.  The tumor produces ACTH on it’s own, stimulating cortisol production by the adrenals.  That in turn shuts down the pituitary from producing it, because there is already enough or too much.  It means that our bodies don’t react normally to internal nor external stressors.  We have FAR too much cortisol at night, when it should be almost non-existent in the body to allow for sleep.  We can have low cortisol during the day when we need it to be active.  We can be “revved up” like we’re running a marathon while sitting on a chair, resting.  But it also means that when we are stressed, ill (just a cold, even), in pain, or exerting extra energy, our body does not have the feedback to produce more cortisol to allow us to function appropriately.

This is why even in a high cortisol day, if I overdo it, I can crash so hard I can’t keep my eyes open.  Why I can become so cold that blankets, warm clothes and a wood stove (on an already warm day) cannot warm me up.  Why I can become nauseated (another low symptom) and that can lead to serious danger (Look up adrenal crisis).  You see, if I use up whatever my tumor is producing, generally speaking, my pituitary doesn’t fill in the gap because it is suppressed (asleep).  It doesn’t say “She’s doing too much, let’s produce more hormones so she can get through it.”  I’ve noticed this happen in cortisol highs and lows.  Generally I’m FAR more careful in a low because I already know my body cannot handle much of anything, but there were times when I would push myself in a high to get a job done, and then I would crash and burn.  It was bad news and I didn’t understand how dangerous it was at the time (okay, I still do it sometimes, but I REALLY try not to).  And sadly, unlike the normal progression of tiring while exerting yourself, it generally didn’t come with any warning signs.  I was capable, then I wasn’t.  It was sudden.  I cannot tell when I am coming up on that wall, but once I hit it, it is too late.  I am ill, not just a little tired.  And because sleep only does a little in my Cushing’s situation, I don’t start fresh tomorrow.  Now I’m in the whole…one I might not recover from.  This new level of exhaustion at times has become my new “normal.”  It’s bad news, but it’s my life.  So if I say something as silly as driving in “Nowhere, Alaska” is too stressful, I mean it.  It can make me physically ill, and it doesn’t mean I mentally stress over it..it is my body recognizing the energy drain.  I cannot lose any more of what I currently have…there just isn’t enough left.

I know this sounds so negative and depressing.  It is.  It wasn’t my intent to end that way, but the reality is, this disease hurts us so much already, we don’t need misunderstanding (even misguided desires to help) causing us more.  And seriously, just ask!  We would love nothing more than to educate others about what we’re going through.  We know it is so convoluted and overwhelming and that you can only handle little tidbits at a time, but any understanding is better than none.  It can be so hard for us not to do those things we used to, especially things we consider necessary, simple, or things we love and enjoy, and it helps to have someone understand that and not pressure us into doing more than we should or judging us for not reacting like we used to.  We still want to be friends and would love nothing more than to help you or go do those fun things with you…we just know our limits.  Stick by us and please don’t take it personally.

Adrenal Insufficiency

 

💡 Did you know some people live without adrenal glands at all?
This can happen due to:
🔹 Surgery – for tumors like pheochromocytoma or Cushing’s
🔹 Metastatic cancer – when cancer spreads to both adrenal glands
🔹 Bleeding into the glands, infections like TB
🔹 Or genetic conditions (like CAH) where glands are non-functional
🧬 In all these cases, the result is the same:
➡️ No cortisol. No aldosterone. No hormone backup.
This is called absolute adrenal insufficiency.
📌 When you have no adrenal glands, your body relies 100% on replacement therapy. There’s zero margin for error – even a delayed dose or skipped salt can lead to crisis.
👉 That’s why we made today’s image – with everything you NEED to know if you (or someone you love) is living without adrenal glands.
💙 Save it. Share it. Advocate.

⁉️ Myths and Facts about Cushing’s: UFC’s are the Gold Standard for Cushing’s testing

Myth: UFC’s are the Gold Standard for Cushing’s testing

myth-busted

Fact: UFC stands for Urinary Free Cortisol. In layman’s terms this test assesses cortisol by collecting urine for 24 hours. It was once thought that this was the gold standard and the end all and be all in terms of assessing Cushing’s in a patient. What we now know is that this is not necessarily true. Though this test is helpful in assessing for Cushing’s in some patients, not all patients have positive labs with this test, even if they DO, in fact, have Cushing’s.

There are various theories as to why. Cyclical Cushing’s patients also tend to report having a lower prevalence of positive UFCs in their test batteries.

Cushing’s experts understand that the most effective way to test for Cushing’s, especially in cases where it is suspected that the patient is cycling, is to administer multiple test measures across an extended period of time.

The following links may be helpful:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2978784/

Click to access LimitationsSC_UFC_dex_mildCS.pdf

http://survivethejourney.blogspot.com/2008/08/when-gold-standard-becomes-tarnished.html

 

Dr. Karen Thames has been sharing these on her Facebook Page, Empowering People with Invisible Chronic Illness – The EPIC Foundation

She has graciously given me permission to share them here and on the Cushing’s Help message boards.

ℹ️ Basics: Cushing’s Syndrome Overview

Cushing’s syndrome is a rare disorder that occurs when the body is exposed to too much cortisol. Cortisol is produced by the body and is also used in corticosteroid drugs. Cushing’s syndrome can occur either because cortisol is being overproduced by the body or from the use of drugs that contain cortisol (like  prednisone ).

Cortisol is the body’s main stress hormone. Cortisol is secreted by the adrenal glands in response to the secretion of adrenocorticotropic hormone (ACTH) by the pituitary. One form of Cushing’s syndrome may be caused by an oversecretion of ACTH by the pituitary leading to an excess of cortisol.

Cortisol has several functions, including the regulation of inflammation and controlling how the body uses carbohydrates, fats, and proteins. Corticosteroids such as prednisone, which are often used to treat inflammatory conditions, mimic the effects of cortisol.

Stay tuned for more basic info…

ℹ️ Basics: Testing: Dex Tests

Dexamethasone suppression test measures whether adrenocorticotrophic hormone (ACTH) secretion by the pituitary can be suppressed.

How the Test is Performed

During this test, you will receive dexamethasone. This is a strong man-made (synthetic) glucocorticoid medicine. Afterward, your blood is drawn so that the cortisol level in your blood can be measured.

There are two different types of dexamethasone suppression tests: low dose and high dose. Each type can either be done in an overnight (common) or standard (3-day) method (rare). There are different processes that may be used for either test. Examples of these are described below.

Common:

  • Low-dose overnight — You will get 1 milligram (mg) of dexamethasone at 11 p.m., and a health care provider will draw your blood the next morning at 8 a.m. for a cortisol measurement.
  • High-dose overnight — The provider will measure your cortisol on the morning of the test. Then you will receive 8 mg of dexamethasone at 11 p.m. Your blood is drawn the next morning at 8 a.m. for a cortisol measurement.

Rare:

  • Standard low-dose — Urine is collected over 3 days (stored in 24-hour collection containers) to measure cortisol. On day 2, you will get a low dose (0.5 mg) of dexamethasone by mouth every 6 hours for 48 hours.
  • Standard high-dose — Urine is collected over 3 days (stored in 24-hour collection containers) for measurement of cortisol. On day 2, you will receive a high dose (2 mg) of dexamethasone by mouth every 6 hours for 48 hours.

Read and follow the instructions carefully. The most common cause of an abnormal test result is when instructions are not followed.

How to Prepare for the Test

The provider may tell you to stop taking certain medicines that can affect the test, including:

  • Antibiotics
  • Anti-seizure drugs
  • Medicines that contain corticosteroids, such as hydrocortisone, prednisone
  • Estrogen
  • Oral birth control (contraceptives)
  • Water pills (diuretics)

How the Test will Feel

When the needle is inserted to draw blood, some people feel moderate pain. Others feel only a prick or stinging. Afterward, there may be some throbbing or slight bruising. This soon goes away.

Why the Test is Performed

This test is done when the provider suspects that your body is producing too much cortisol. It is done to help diagnose Cushing syndrome and identify the cause.

The low-dose test can help tell whether your body is producing too much ACTH. The high-dose test can help determine whether the problem is in the pituitary gland (Cushing disease) or from a different site in the body (ectopic).

Dexamethasone is a man-made (synthetic) steroid that binds to the same receptor as cortisol. Dexamethasone reduces ACTH release in normal people. Therefore, taking dexamethasone should reduce ACTH level and lead to a decreased cortisol level.

If your pituitary gland produces too much ACTH, you will have an abnormal response to the low-dose test. But you can have a normal response to the high-dose test.

Normal Results

Cortisol level should decrease after you receive dexamethasone.

Low dose:

  • Overnight — 8 a.m. plasma cortisol lower than 1.8 micrograms per deciliter (mcg/dL) or 50 nanomoles per liter (nmol/L)
  • Standard — Urinary free cortisol on day 3 lower than 10 micrograms per day (mcg/day) or 280 nmol/L

High dose:

  • Overnight — greater than 50% reduction in plasma cortisol
  • Standard — greater than 90% reduction in urinary free cortisol

Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or may test different specimens. Talk to your doctor about the meaning of your specific test results.

What Abnormal Results Mean

An abnormal response to the low-dose test may mean that you have abnormal release of cortisol (Cushing syndrome). This could be due to:

The high-dose test can help tell a pituitary cause (Cushing disease) from other causes. An ACTH blood test may also help identify the cause of high cortisol.

Abnormal results vary based on the condition causing the problem.

Cushing syndrome caused by an adrenal tumor:

  • Low-dose test — no decrease in blood cortisol
  • ACTH level — low
  • In most cases, the high-dose test is not needed

Ectopic Cushing syndrome:

  • Low-dose test — no decrease in blood cortisol
  • ACTH level — high
  • High-dose test — no decrease in blood cortisol

Cushing syndrome caused by a pituitary tumor (Cushing disease)

  • Low-dose test — no decrease in blood cortisol
  • High-dose test — expected decrease in blood cortisol

False test results can occur due to many reasons, including different medicines, obesity, depression, and stress. False results are more common in women than men.

Most often, the dexamethasone level in the blood is measured in the morning along with the cortisol level. For the test result to be considered accurate, the dexamethasone level should be higher than 200 nanograms per deciliter (ng/dL) or 4.5 nanomoles per liter (nmol/L). Dexamethasone levels that are lower can cause a false-positive test result.

Risks

There is little risk involved with having your blood taken. Veins and arteries vary in size from one patient to another, and from one side of the body to the other. Taking blood from some people may be more difficult than from others.

Other risks associated with having blood drawn are slight, but may include:

  • Excessive bleeding
  • Fainting or feeling lightheaded
  • Multiple punctures to locate veins
  • Hematoma (blood accumulating under the skin)
  • Infection (a slight risk any time the skin is broken)

Alternative Names

DST; ACTH suppression test; Cortisol suppression test

References

Chernecky CC, Berger BJ. Dexamethasone suppression test – diagnostic. In: Chernecky CC, Berger BJ, eds. Laboratory Tests and Diagnostic Procedures. 6th ed. St Louis, MO: Elsevier Saunders; 2013:437-438.

Guber HA, Oprea M, Russell YX. Evaluation of endocrine function. In: McPherson RA, Pincus MR, eds. Henry’s Clinical Diagnosis and Management by Laboratory Methods. 24th ed. St Louis, MO: Elsevier; 2022:chap 25.

Newell-Price JDC, Auchus RJ. The adrenal cortex. In: Melmed S, Auchus RJ, Goldfine AB, Koenig RJ, Rosen CJ, eds. Williams Textbook of Endocrinology. 14th ed. Philadelphia, PA: Elsevier; 2020:chap 15.

Review Date 5/13/2021

Updated by: Brent Wisse, MD, Board Certified in Metabolism/Endocrinology, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.

From https://medlineplus.gov/ency/article/003694.htm

😳 A *Bit* Misleading

Headline: “‘I gained 10st due to a rare condition – I lost it again by doing a simple daily exercise’
Hannah Mai, 37, managed to lose the weight in two years by doing a simple daily exercise”

She did lose the weight but, reading the article, also “Following her diagnosis, Hannah underwent brain surgery in February 2021 to remove the pituitary tumour causing her condition and was prescribed steroids to manage it.”

Just a bit of a misleading header.

Here’s the whole article.  And it was a bit more than a “simple daily exercise” and removing a pituitary tumor!


A woman who piled on 10 stone due to a rare condition has shed the weight in just two years, thanks to a daily exercise routine.

Hannah Mai, 37, was diagnosed with Cushing’s disease, a hormonal disorder caused by high cortisol levels, in October 2020 after gaining 10 stone in just two and a half years.

Following her diagnosis, Hannah underwent brain surgery in February 2021 to remove the pituitary tumour causing her condition and was prescribed steroids to manage it.

In April, 2023, Hannah was taken off her steroid medication and was determined to shed the 10 stone she gained due to the disease – who weighed 20 stone 5lbs and was a size 26.

Through a combination of high-protein meals and daily pilates sessions, Hannah impressively slimmed down to 10 stone 4lbs, fitting into a size 10, all within two years.

Hannah, from Coventry, Warwickshire, said: “Once I started losing the weight, I just kept going.

“It isn’t easy, you really have to push yourself, and focus on who you want to be and think about who you want to be.”

When she turned 30, Hannah noticed she started gaining weight and went from nine stone to 16 stone in a few months. She revealed that despite frequent doctor visits, she was constantly asked if she was expecting or if her weight gain was due to hormonal changes.

Hannah shared: “I was always around nine stone, but I noticed how I started to gain a bit of weight. I knew there was something wrong with me, but people around me thought I had changed my diet and asked if I was eating more.

“I was asked if I was pregnant six times, and told that my weight gain could be caused by hormones. I went up to 20 stone at my heaviest.”

In October 2020, over two years since her weight began to increase, Hannah woke up one day with a hunched back.

After a quick Google search suggested Cushing’s disease as a possible cause, and noticing the other symptoms including weight gain, she immediately sought medical advice.

She was referred to University Hospital Coventry & Warwickshire, where an MRI scan and blood tests confirmed she had Cushing’s disease.

Hannah added: “I printed off the list of symptoms and took them to my doctor, who then referred me to the hospital.

“There, I had an MRI scan and blood tests, which confirmed that I had Cushing’s disease.

“I was relieved but scared when I got the diagnosis. I had been saying for years that there was something wrong with me.”

Five months post-diagnosis, in February 2021, Hannah underwent brain surgery to remove the pituitary tumour causing the condition, and was put on steroids to manage her symptoms.

After battling with her health and spending two years on steroids to manage her condition, Hannah came off the medication as her health improved.

After she came off her medication, Hannah said she knew she was better and became determined to lose weight.

She said: “It wasn’t easy to lose weight whilst I was still on steroids, as soon as I came off them, I knew this was my body and I was a lot better.

“I really pushed myself, I worked super hard, cut out all sugar, cut out dairy, and gluten after I was diagnosed with celiac disease.

“I have a low-carb, high-protein diet with lots of vegetables, and I do pilates every day.”

Her commitment paid off as she impressively slimmed down from 20 stone to 10 stone within two years. She went from wearing a size 26 clothes to wearing a size 10 – back to where she was before Cushing’s disease.

Hannah said: “I am super proud of myself, I am always worried that the weight will come back.

“I feel so much happier. When I look back at myself, I just can’t believe I was that size.

“When I look back at old photos, I feel very sad about what happened to me, but it makes me think that I need to be proud about how far I have come.”

Adapted from https://www.mirror.co.uk/news/health/i-gained-10st-due-rare-35432462