S2E9: Spit Happens: The Truth About Cortisol Testing
Welcome to Clearly Hormonal
(formerly Reset Recharge)
Picture three women: one mailing off multiple saliva samples looking for answers about “adrenal fatigue,” another using steroids for years with undetected adrenal suppression, and a third being told her exhaustion is adrenal fatigue when it’s actually perimenopause. Same hormone, same adrenal glands—three very different ways we get cortisol wrong.
In this episode, Dr. Patil-Sisodia unpacks all three. She explains why multi-sample saliva and urine tests can seem convincing despite being used to diagnose a condition that doesn’t medically exist, and reveals the irony that the same testing format is actually a gold-standard tool for screening Cushing’s syndrome. She then covers the tests that truly work, the many conditions that can mimic Cushing’s, and the often-overlooked problem of steroid-related adrenal insufficiency, which affects about half of long-term steroid users but is rarely tested for.
She closes by exploring how often perimenopause is mistaken for adrenal fatigue, what women lose when that happens, and three simple questions to ask before trusting any cortisol test.
Cortisol Testing, Decoded: Adrenal Fatigue vs. Real Adrenal Disease
By Dr. Komal Patil-Sisodia, MD | Eastside Menopause & Metabolism
How to tell the difference between a wellness product borrowing the language of science and a test that could actually catch a real diagnosis.
Right now, someone is spitting into four little tubes throughout the day, mailing them off to a lab, hoping to finally get answers about their "adrenal fatigue." Meanwhile, someone who's been on a steroid inhaler for years — or just got a cortisone shot in their knee — has never once had their adrenal glands checked, even though about half of people in that exact situation would test abnormal if anyone looked. And somewhere else, a woman in her late forties is being told her exhaustion and brain fog are adrenal fatigue, when what she actually needs is a conversation about perimenopause.
Same hormone. Same small gland sitting on top of each kidney. Three completely different ways we get this wrong.
The Myth: Adrenal Fatigue and the Cortisol Curve
Multi-sample saliva and urine kits — like the Dutch test — promise to map your cortisol rhythm across the day. They're marketed for "adrenal fatigue" and "chronic stress," neither of which is a recognized medical diagnosis. The tests themselves run on legitimate lab equipment, the same precision machinery hospitals use for real hormone testing. That's exactly what makes them so convincing — it's a good machine pointed at the wrong question.
The core problem: there is no agreed-upon normal range for these all-day panels when it comes to diagnosing an actual adrenal condition like adrenal insufficiency or Cushing's syndrome. Cortisol is supposed to be low in the afternoon and evening — that's normal physiology, not a red flag. Reading meaning into the shape of that daily curve isn't how adrenal function is actually evaluated.
The Plot Twist: Multi-Sample Testing Is Real — For a Different Question
Collecting a late-night saliva sample, repeated two to three nights in a row, is one of the gold-standard screening tools for Cushing's syndrome — when the body makes too much cortisol. It correctly identifies the condition roughly 96% of the time and correctly clears people who don't have it about 93% of the time. That's strong performance for a screening test.
The difference is precision: this isn't a curve across a whole day. It's the same meaningful time point — around 11 p.m. for someone on a normal sleep schedule, or an hour before bed for night-shift workers — repeated because cortisol can swing from night to night. Same format as the unproven kits (multiple saliva samples), completely different validity, because the timing and the question being asked actually match.
The Other Direction: Cushing's Syndrome and Pseudo-Cushing's
Three tests actually work for Cushing's syndrome: the repeated late-night saliva sample, a 24-hour urine cortisol collection, and an overnight dexamethasone suppression test. But all three can come back abnormal in people who don't have Cushing's — a pattern called pseudo-Cushing's, driven by depression (up to 80% of people with major depression show some cortisol disruption), heavy alcohol use, obesity, poorly controlled diabetes, PCOS/PMOS, physical stress from illness or surgery, eating disorders, or intense exercise. The elevations in pseudo-Cushing's tend to be milder than true Cushing's, though there's a real gray zone in between — which is why a normal result on any of these tests is genuinely reassuring news.
The Condition Everyone's Missing: Steroid-Induced Adrenal Insufficiency
About half of people on long-term steroids — or who recently stopped one — have some degree of adrenal insufficiency. Fewer than 1% have ever been tested for it. This isn't limited to prednisone pills for chronic illness: steroid inhalers, creams used over large areas long-term, nasal sprays, and cortisone injections can all quietly suppress natural adrenal production. Even Depo-Provera, a common contraceptive injection, can suppress the adrenal axis — a connection that's easy to miss because it doesn't always make it onto a medication list.
Worth a real conversation with your doctor (not a panel ordered online) if you're tapering a steroid after high-dose or long-term use, using more than one steroid type at once, on a high-dose inhaler or cream for over a year, had a steroid injection in the past two months, or are taking certain antifungal or antiviral medications that prolong how long steroids stay active in the body.
Getting It Right: How Adrenal Insufficiency Is Actually Diagnosed
First, if you’re on steroids, taper to a low, steady steroid dose. Testing on a high dose gives an inaccurate picture. Then, a morning blood draw between 8 and 9 a.m., at least a full day after the last dose. Results sit on a spectrum rather than a hard cutoff: above 10 generally suggests recovered adrenal function; 5 to 10 is genuinely unclear and usually means retesting in a few weeks to months; below 5 raises concern for true adrenal insufficiency, and below 3 is close to diagnostic. When the picture is unclear, a cosyntropin stimulation test (the standard 250-microgram version, not the unvalidated 1-microgram version some sources promote) can clarify things further. Recovery, when it's needed, can take anywhere from a few months to over a year. That timeline is normal, not a sign anything's gone wrong.
When Menopause Gets Mislabeled as Adrenal Fatigue
Brain fog, fatigue, anxiety, disrupted sleep, mood changes, lower sex drive — these are common menopause symptoms, but they're also strikingly nonspecific. One large study of over 145,000 symptom reports found that fatigue, headaches, anxiety, and brain fog show up across every stage of a woman's reproductive life, not just the menopause transition. In that research, only hot flashes and vaginal dryness reliably tracked specifically with menopause. Everything else can show up for a long list of other reasons — including a perimenopause that never gets named, because the same vague symptoms get scooped up under an adrenal fatigue label instead.
Nobody has actually studied how often this specific mix-up happens — that number doesn't exist in the research. What's clear is why it happens: overlapping nonspecific symptoms, plus a label with no real diagnostic test behind it. And the cost is real — menopause symptoms are already widely under-treated, and an unproven adrenal fatigue detour is time a woman could have spent getting care that actually helps.
Three Questions to Run Any Cortisol Test Through
What specific condition is this test actually proven to diagnose? Not "stress" or "adrenal fatigue" generally — a real named diagnosis, like adrenal insufficiency or Cushing's syndrome.
Is the timing meaningful for that diagnosis? Morning testing for adrenal insufficiency; same-time, repeated late-night testing for Cushing's. All-day sampling is a warning sign, not a selling point.
Has this exact test been validated against the gold standard for that condition? Good lab equipment doesn't guarantee the test is being used correctly.
The Bottom Line
This was never about saliva versus blood, or one sample versus four. Good testing means matching the right sample, the right timing, and the right method to a real medical question. That precision protects people three ways: it prevents over-testing and over-diagnosis with kits that were never proven to work, it keeps people with real steroid-related adrenal problems or Cushing's syndrome from slipping through the cracks, and it keeps a made-up label from standing between a woman and an honest conversation about perimenopause and menopause.
Follow Dr. Komal Patil-Sisodia:@drpatilsisodia on Instagram and TikTok
This content is for educational purposes only and does not constitute personalized medical advice. Please discuss your specific health concerns with your own healthcare provider.