The Lab Test Lie Wellness Influencers Are Selling You

Annie drunk at the vet

You are standing in a barn at 6am, wrapping legs, hauling hay, running on coffee and sheer determination, and somewhere between classes you found a reel that told you to get your cortisol checked, your DUTCH test done, your vitamin D optimized, your hormones mapped, and your adrenal function evaluated. The reel had 400,000 likes and a very pretty graphic. The woman in it had a medical title that sounded official.

Here is what she did not tell you: most of those tests will not change a single thing about how you are managed. Not one. This is not an opinion. This is what the science actually says, and I am going to walk you through it.

The Lab Test Obsession Is a Business Model

Let me be direct about something before we get into the specifics. The wellness industry sells you tests the same way the supplement industry sells you pills: by creating the feeling that you are being proactive, that knowledge is power, that more information is always better. The problem is that in medicine, more information is only better when it changes what you do. A lab result that does not alter your diagnosis, your treatment, or your risk assessment is not useful information. It is noise. And noise, as any good physician will tell you, makes it harder to find the signal.

The labs being sold to you in those viral posts were not designed by evidence-based medicine. They were designed to sell. Here are the five that show up most often, what the research actually says about them, and why ordering them is doing you no favors.

The Five Labs Wellness Culture Pushes That the Science Doesn't Back

#1 - The Cortisol Panel, Including the DUTCH Test

Spend five minutes in wellness spaces online and you will be convinced that your cortisol is the source of every problem you have ever had. Tired? Cortisol. Weight that won't move? Cortisol. Moody and bloated and not sleeping? Cortisol. The solution, naturally, is to test it. The DUTCH test in particular gets pushed hard, often for a few hundred dollars, as the comprehensive picture of your adrenal health.

Here is the problem. The DUTCH test is not FDA-cleared, and a systematic review of 58 observational studies found that "adrenal fatigue," the condition it is most often used to diagnose, does not exist as a medical entity. Cedars-Sinai Endocrinology is direct about it: "Adrenal fatigue is not an actual disease." The American Endocrine Society does not recognize it. No national endocrinology body recognizes it.

If your physician suspects true adrenal insufficiency, the diagnostic test is an ACTH stimulation test performed under controlled clinical conditions, not a dried urine sample mailed to a lab. A random cortisol level, whether from blood, urine, or saliva, fluctuates dramatically based on the time of day, what you ate, how stressed you were during the draw, and how much sleep you got the night before. A single snapshot tells you almost nothing actionable, and if you are treating a condition that does not exist, you are wasting money at best and causing harm at worst.

#2 - The Full Hormone Panel (Estradiol, FSH, LH, Progesterone) as a Routine Screen

This one hits particularly close to home for my perimenopausal patients, who are often convinced they need all four of these values to understand what their hormones are doing. The appeal makes sense. You feel different. Something has shifted. You want proof, a number you can point to that explains why you feel this way.

Here is the clinical reality: a single estradiol level during perimenopause is nearly meaningless. Estradiol can be high or low on different days of the same week. One snapshot might look completely normal while your next draw looks postmenopausal. FSH rises as the ovaries become less responsive, which is useful context, but FSH also fluctuates dramatically during the perimenopausal transition, and a normal FSH does not rule out perimenopause. According to clinical guidelines from NICE, FSH testing is not routinely needed for diagnosis in women over 45 with classic symptoms. The diagnosis is clinical. Meaning: I listen to you. This matters enormously for weight management in perimenopause, because women often believe that if they just found the right hormone level and got it treated, the weight would respond. The relationship between estrogen, body composition, and weight is real and documented. But treating it is not a numbers game. It is a symptoms and context game, and no single panel tells us when to start treatment or what dose to use.

#3 - Vitamin D as a Routine Wellness Screen

The vitamin D push is everywhere, and it feels responsible. Most people are told they are deficient, they take a supplement, they feel like they did something good. The problem is that the evidence for routine screening in asymptomatic adults simply is not there.

The US Preventive Services Task Force, which is the independent body that evaluates all preventive health screenings, reviewed 46 studies covering more than 16,000 participants and issued an "I" statement on vitamin D screening. That means insufficient evidence to determine whether routine screening provides more benefit than harm. The review found that treating vitamin D deficiency did not reduce risk of cancer, type 2 diabetes, cardiovascular events, fractures, falls, or death in asymptomatic community-dwelling adults. No national primary care organization currently recommends routine, population-wide vitamin D screening.

Is there a place for vitamin D testing? Absolutely. Patients with malabsorption disorders, bone disease, chronic kidney disease, or documented risk factors are a different conversation. Testing an asymptomatic person because a wellness influencer told them to is a different conversation entirely.

#4 - The Comprehensive Thyroid Panel Beyond TSH

Every wellness panel includes thyroid antibodies, free T3, free T4, reverse T3, and sometimes more. The standard of care for screening asymptomatic people is TSH alone. TSH is the most sensitive indicator of thyroid dysfunction because it is the hormone the pituitary gland uses to regulate the thyroid. When the thyroid is underperforming, TSH rises before free T3 or T4 becomes abnormal. A TSH that comes back in normal range tells you what you need to know for screening purposes.

Reverse T3 is the lab that I see ordered most aggressively in wellness spaces, often framed as the hidden reason you cannot lose weight. There is no clinical evidence supporting routine reverse T3 testing as a screening tool. Elevated reverse T3 can occur with acute illness, calorie restriction, or high physiological stress, meaning the very things many riders and weight management patients are already dealing with. Interpreting that number without clinical context is like trying to diagnose a lame horse with a single out-of-context radiograph. You need the whole picture.

#5 - Inflammatory Markers Like hs-CRP as a Standalone Screen

High-sensitivity CRP gets pushed in wellness content as a window into hidden inflammation, a predictor of everything from heart disease to weight resistance. The problem is that CRP is extraordinarily nonspecific. It rises with any infection, any injury, any inflammatory condition, any recent intense exercise session. An equestrian who just hauled eight hours to a show, did four classes, and maybe tweaked a shoulder is going to have a very different CRP than the same person on a rest day. Without clinical context and a clear reason for testing, a number on a lab report does not tell you what is causing it or what to do about it.

Now Here Is What the Science Actually Does Support

This is the part that matters. These are the labs that consistently change management, have strong evidence behind them, and are recommended by the organizations that actually review clinical data.

Fasting glucose and hemoglobin A1c. These two tell us about blood sugar regulation and metabolic health. A fasting glucose starting to creep toward the prediabetes range, or an A1c between 5.7 and 6.4, changes everything about a weight management plan. It tells us which medications may work best, what dietary patterns matter most, and what the long-term cardiovascular risk picture looks like. This is one of the most actionable labs in the panel.

The lipid panel. Total cholesterol, LDL, HDL, and triglycerides together give a cardiovascular risk picture that guides real decisions. Elevated triglycerides in particular are often connected to insulin resistance, which is directly relevant to weight management and hormonal health in women in midlife. This lab changes prescribing decisions, lifestyle recommendations, and sometimes reveals insulin resistance that no other single test would have caught.

TSH. One test. One number. Thyroid dysfunction is genuinely common in women, especially in perimenopause, and an underactive thyroid mimics almost every symptom that gets blamed on cortisol or hormones. Fatigue, weight gain, cold intolerance, brain fog, constipation: all thyroid. A TSH catches it. Ordering 15 additional thyroid markers without a clinical reason to do so does not make this more accurate.

CBC and CMP. The complete blood count and comprehensive metabolic panel are the baseline of baseline labs. Anemia, which is common in premenopausal women and in anyone with heavy periods, causes fatigue, exercise intolerance, and poor recovery. The CMP tells us about kidney function, liver function, electrolytes, and blood glucose all at once. These are the labs that catch things early, before they cause problems, and they are cheap, widely available, and genuinely useful.

Save Your Money For Show Pads and Matching Shirts

You do not need 27 labs. Through our direct pay relationship with labs, the recommended initial lab panel that actually gives us actionable information is $32-$61 depending on your other conditions. That's it.

The secret is that I'm not selling you the labs. I don't make money off your labs, so I don't have any reason to sell you something you don't need. What you need a physician who actually looks at the results in the context of your symptoms, your history, your goals, and your life. A number without context is not health care. It is expensive anxiety.

The wellness influencer who sold you that panel is probably not a bad person. She probably believes what she is saying. The problem is that believing something very confidently is not the same as having evidence for it.

You already know how to tell the difference between a real lameness and a horse who is just having an off day. You know how to read what is actually happening versus what someone is telling you to see. This is no different.

The labs that will actually change your care are boring, affordable, and covered by most insurance plans. The labs that go viral are expensive, largely uninterpretable without clinical context, and profitable for the people selling them.

Talk to a real doctor. Get the boring labs. Skip the noise. I am Dr. Torree McGowan. I treat riders at the show and online. If you want to talk about what your labs actually mean for your weight, your hormones, and your health, this is exactly what I do. Find me at presencemd.net.

TL;DR on the Studies Referenced

The basics: Multiple independent evidence reviews and USPSTF recommendations evaluating the utility of routine screening labs in asymptomatic women.

Who was in the study: Community-dwelling, asymptomatic adult women across multiple large randomized and observational studies; the vitamin D review alone included 46 studies with over 16,000 participants.

What they did: Reviewed evidence for whether routine screening tests, including vitamin D, cortisol, comprehensive thyroid panels, and hormone panels, changed health outcomes in people without symptoms or known conditions.

The results: The USPSTF found insufficient evidence to recommend routine vitamin D screening in asymptomatic adults. A systematic review of 58 studies found no substantiation that adrenal fatigue exists as a medical condition. Clinical guidelines from NICE and major OB-GYN organizations do not support routine hormone panel testing in women over 45 with classic perimenopausal symptoms, as the diagnosis is clinical. Reverse T3 and hs-CRP lack evidence as routine standalone screening tools.

Why it matters: Tests that do not change management create false reassurance, unnecessary anxiety, and real financial cost. The evidence-based labs that do change management are fasting glucose, HbA1c, lipid panel, TSH, CBC, and CMP.

The catch: Some of these tests are appropriate in specific clinical contexts. The issue is not the test itself but the indiscriminate application of it to everyone regardless of symptoms, risk factors, or clinical indication.

How it works (probably): Wellness culture profits from the feeling of taking action. A lab panel feels like doing something, even when the results are uninterpretable without clinical context or unlikely to change treatment. Evidence-based medicine asks a different question: does this test result change what I do for this patient? For most of the labs being pushed in wellness content, the answer is no.