Which midlife health tests and apps are worth it?

Functional-medicine doctors were right about some things years before the guidelines caught up. They’re not right about everything. This guide starts with your skin, then moves on to the rest of your health. Tests and tools are sorted into four groups: the established baseline, recent changes worth acting on, new tools that aren’t proven yet, and popular options you can skip.

Start with your skin

Your skin is the one organ you can see every day, and it often shows changes elsewhere in the body first. Before looking at blood tests and gadgets, it’s worth knowing what midlife skin changes are normal, which ones are worth a test, and which skin tests actually tell you something.

What changes at midlife, and why

As estrogen falls around menopause, skin changes in ways most of us notice.

Less collagen. Skin loses up to about 30% of its collagen in the first five years after menopause, then around 2% a year after that. It becomes thinner, slacker and slower to heal.

A weaker barrier. The skin makes fewer of the lipids that seal in water (ceramides and natural oils). It dries out faster, takes longer to recover after irritation, and stings more easily.

More reactivity. Products you used for years can suddenly start to burn or itch.

All of this is normal. It’s also why barrier repair and non-inflaming ingredients matter more at 50 than at 30. Your genes set the starting point, and midlife hormones change the conditions your skin has to work in.

When your skin is telling you to get a blood test

Most midlife dryness is just midlife dryness. But some skin and hair changes are worth mentioning to your doctor, because a simple blood test can find the cause.

• Suddenly very dry, rough skin, thinning outer eyebrows or brittle hair can be a sign of an underactive thyroid. Ask about TSH and thyroid antibodies (TPO).

• Hair shedding, itchy skin without a rash, or brittle nails can be a sign of low iron stores. Ask about ferritin.

• Dark, velvety patches on the neck or in the armpits, slow-healing cuts or frequent skin infections can be signs of insulin resistance or diabetes. Ask about HbA1c and fasting glucose.

• Widespread itch with no rash is occasionally a sign of liver, kidney or blood problems. Ask about a metabolic panel and a full blood count.

• A rash on sun-exposed skin together with joint pain or fatigue can point to an autoimmune condition such as lupus. See your doctor. Specific antibody tests follow from there.

• A new or changing mole, or a sore that won’t heal, needs a dermatologist, promptly.

All of these blood tests are in the baseline list further down. Your skin is one more reason to make sure they’re done.

Skin tests: the baseline

A yearly skin check with a dermatologist. This means a full-body look with a dermatoscope (a magnified, lit lens). It’s the most useful skin “test” there is, and it matters more as skin ages and sun damage adds up.

Patch testing, if your skin keeps reacting. If you have ongoing redness, itching or eczema around the face, eyelids or hands, a dermatologist can patch test you for contact allergies. Fragrance and certain preservatives are among the most common causes. It’s the only reliable way to find out what you’re actually reacting to, and it’s far more useful for sensitive skin than any blood panel.

A patch test at home before using a new product. Apply a little to the inner forearm or behind the ear twice a day for about a week before it goes on your face. This matters most for actives such as retinoids and acids.

Monthly self-checks. Use the ABCDE checklist (asymmetry, border, colour, diameter, evolving), and photograph your moles so you can compare.

Simple clinic tests when a rash isn’t clear. A skin scraping for fungus or a small biopsy is quick, cheap and conclusive.

 

Skin tests: recent and worth knowing about

AI-assisted mole tools used by doctors. Some are now FDA-cleared, including a handheld device for GPs. They help clinicians decide what to refer or biopsy. They’re not the same as consumer phone apps.

Total-body photography, if you have many moles or a history of melanoma. The clinic photographs your whole skin surface so that changes can be tracked precisely over time.

Skin tests: new, interesting, not proven yet

Skin-specific “age” clocks. These read chemical tags on DNA in skin cells collected with a strip of tape. A 2025 study reported accuracy within about four years, and a consumer version is expected in late 2026. They could become a genuinely useful way to test whether skincare works. They can’t yet tell you what to do differently.

Tape-strip RNA tests. These show which skin genes are switched on (inflammation, barrier, collagen). The method is real and used in research, but consumer versions haven’t been independently validated.

Clinic measurements of hydration and barrier. Devices called corneometers and TEWL meters are standard in skincare research. But there’s no “normal” value to compare a single reading against, so they’re useful only for tracking your own skin over time.

Skin tests: skip

DNA kits that recommend skincare from your genes. They read a handful of gene variants and then suggest products. Having a gene doesn’t mean it’s active, and no study shows that gene-matched skincare works better than choosing products for the skin you actually have.

Skin microbiome swabs. There are no reference ranges and no evidence that the results should change your routine. If your skin is persistently red, flaky or bumpy, see a dermatologist instead: conditions like rosacea, seborrhoeic dermatitis and fungal acne are diagnosed by examination, sometimes with a simple scraping.

AI “skin age” selfie apps and phone mole checkers. Selfie scores change with lighting and camera. A 2020 BMJ review found the studies behind mole-checking apps were small and poor quality, and that the apps can miss melanomas. Use your phone as a photo diary and leave the judgement to a dermatologist.

Blood or IgG “skin sensitivity” panels. These don’t detect contact allergies. Patch testing does.

What this means for your routine

At midlife, the most reliable “test” is how your skin responds. Does it feel tight, sting or flake? Does it settle when you change what you use? Choose products for the skin you have now: a strong barrier, daily sun protection, and active ingredients that don’t inflame. That’s the thinking behind everything we make at Steinder Weisen. Skin can only tell you so much, though. The rest of this guide covers the tests that look underneath it.

The Layland Method: putting this into practice

Everything above points to the same conclusion: at midlife, the biggest gains come from a routine your skin can tolerate every day, not from more tests or stronger actives. The Layland Method is our attempt to build that routine for you.

What it is It’s a complete eight-step routine for dry, sensitive, hormonally changing or visibly ageing skin. It’s for anyone who wants to be told exactly what to use, and when, instead of building a routine one product at a time.

What’s in it

• PASTÈSE: a cleansing pâte that removes sunscreen and makeup without stripping the skin

• BUFFÈRE: a hydrating buffer with ectoin, panthenol, ceramides and cholesterol, used before actives on sensitive skin

• ROWANE: daytime antioxidant care with azelaic acid, vitamin C, niacinamide and ferulic acid

• FIRÈNE: a multi-peptide concentrate for the look of firmness

• LAMELLARE: a lipid crème that replenishes the barrier with ceramides, cholesterol and copper peptide

• LISSE: a gentle exfoliant with mandelic and lactic acids, used on set evenings only

• RÉAU: a retinoid with retinyl linoleate and bakuchiol, used on separate evenings from LISSE

• BASTINA: an overnight lipid seal, used when skin needs it

How it works: the rhythm matters as much as the products

The method rotates three kinds of evening:

• Exfoliation night: PASTÈSE, BUFFÈRE (optional), LISSE, LAMELLARE, then BASTINA if needed.

• Retinoid night: PASTÈSE, BUFFÈRE (optional), RÉAU, LAMELLARE, then BASTINA if needed.

• Recovery night: PASTÈSE, BUFFÈRE, LAMELLARE, then BASTINA if needed. No acids, no retinoid.

Mornings are simple: PASTÈSE or water, ROWANE, FIRÈNE, then SPF 50.

LISSE and RÉAU are never used on the same evening. That’s deliberate. Earlier in this post we looked at how more retinoid can mean more inflammation, and how a weakened barrier makes everything sting more. Recovery nights and a barrier buffer are built in so your skin gets the benefit of actives without being pushed into irritation.

How to test it on your own skin

As this post argues, the most useful test for skincare is how your skin actually responds. So:

1. Patch test first. Try each active product (LISSE, RÉAU, ROWANE) on the inner forearm or behind the ear for several days before using it on your face.

2. Take a baseline photo in the same light, at the same time of day, before you start.

3. Keep a simple log for six to eight weeks: tightness, stinging, flaking, redness, and how your skin feels in the morning.

4. Expect an adjustment period. Some dryness or mild flaking in the first few weeks of a retinoid is common. If your skin stings or reddens, add more recovery nights and use BUFFÈRE first, rather than pushing through.

5. Compare at six to eight weeks. Visible changes to texture and tone take at least one full skin-renewal cycle, and renewal slows with age.

If your skin keeps reacting despite this, stop and see a dermatologist. Patch testing in clinic can show whether you’re allergic to a specific ingredient, which is far more useful than guessing.

About the Founder Batch

The Layland Method is part of our Founder Batch, the first public release of the Steinder Weisen collection, made in limited production. While we finish our permanent retail packaging, Founder Batch products may arrive with simplified labels that don’t list every detail on the container. The full ingredient list, directions and warnings for every product are on its product page and stay available after you buy. Because we use natural botanicals, colour, texture and scent can vary slightly from batch to batch.

Price: $832 for the complete method (a $1,040 value if bought separately).

Explore The Layland Method

Apps and wearables: which are worth it

Your phone and watch can now do things that needed a clinic visit ten years ago. A few features are cleared by the FDA as medical devices, which means the FDA reviewed them for one specific job. Most health apps have had no such review. Here’s how to tell them apart.

Worth it

ECG on your wrist or phone
The Apple Watch ECG app, Samsung Health Monitor, Withings ScanWatch and KardiaMobile (a small pad that works with your phone) can all record an FDA-cleared single-lead ECG in 30 seconds and check it for atrial fibrillation (AFib). AFib becomes more common with age, raises stroke risk and can come and go without symptoms. You can save each tracing as a PDF for your doctor. It can’t detect a heart attack and isn’t a full hospital ECG.

Irregular rhythm alerts
These are a background feature on most of the same watches. They check your pulse pattern for signs of AFib and alert you. Alerts are rare, and in a large Apple study, most people who got one and then wore a diagnostic patch did turn out to have AFib.

A validated blood-pressure cuff and its app
This is the single most useful health device you can own. Blood pressure is the biggest risk factor for heart disease and stroke that you can change. Pick an upper-arm cuff listed at validatebp.org. Many cuffs sync to Apple Health or Google Health Connect, so you can show your doctor a week of readings instead of one nervous reading in the clinic.

Your health records in one place
Apple Health Records, Google Health Connect and patient-portal apps such as MyChart pull your lab results from different clinics into one timeline. That makes slow changes easy to spot, such as a creeping HbA1c, a falling ferritin, or a TSH that drifts year to year.

A UV index alert
For skin, this is the most evidence-based app on your phone. Your weather app, or the EPA’s free SunWise UV Index app, tells you when UV reaches 3 or above, the point at which sun protection matters, even on cloudy or cool days.

A symptom tracker for perimenopause
Perimenopause is diagnosed by symptoms, so a good record beats a hormone test. Log hot flushes, sleep, cycle changes, mood, joint aches and skin changes. The free Balance app, Clue, or even a note on your phone will do. Bring a summary to your appointment. Check each app’s privacy settings, and choose one that lets you delete your data.

Medication and supplement reminders
The Medications feature in Apple Health, or any simple reminder app, helps you take things on time and gives your doctor an accurate list. That matters more as prescriptions add up in midlife.

A photo diary for your skin and moles
Your phone’s camera is enough. Photograph moles monthly, and your face in the same light every few weeks, to track changes over time. Keep the photos in a private album. The value is in comparing them, not in an app judging them.

Use with caution

Blood-pressure alerts on a watch
Apple’s version was cleared by the FDA in September 2025. The watch never shows a blood-pressure number. It only flags possible high blood pressure, and in testing it caught about 4 in 10 people who had it. Take an alert seriously, but don’t read no alert as an all-clear. Keep using a cuff.

Sleep apnea alerts
Apple and Samsung watches can flag signs of moderate to severe sleep apnea, which becomes more common after menopause. An alert is a reason to ask for a sleep study, not a diagnosis.

Sleep scores, readiness scores and heart-rate variability
Oura, Whoop, Garmin and similar devices are good at tracking trends in resting heart rate and sleep timing. They’re much less accurate at sleep stages (deep, REM) than a sleep lab. Use them to notice patterns, such as alcohol, late meals or hot flushes disrupting your sleep, and ignore the daily score.

VO2 max estimates
“Cardio fitness” on Apple Watch, Garmin and others is a reasonable way to see whether your fitness is improving. It’s an estimate, so follow the trend, not the number.

Over-the-counter glucose sensors
Dexcom Stelo and Abbott Lingo are FDA-cleared and can show you how meals, sleep and stress affect your blood sugar. Some people find them eye-opening, and others become anxious about normal rises after meals. There’s no agreed “healthy” pattern for people without diabetes. If you try one, a month is usually enough to learn what you need.

Skip

AI mole-checking apps
These are apps that score a photo of a mole for skin cancer risk. A 2020 BMJ review found the studies behind them were small and of poor quality, and that the apps can miss melanomas. False reassurance is the real danger. Photograph your moles yourself and let a dermatologist judge them.

AI “skin age” and skin-analysis selfie apps
Scores change with lighting, camera, makeup and the time of day. Many of these apps exist mainly to recommend products. Your own photos, taken in the same light, are a better record.

“Clean beauty” ingredient-scanner apps
They rate products by flagging ingredients as “toxic,” usually based on hazard lists rather than the amount actually in a product or how it’s used. Safe, well-studied ingredients, including some preservatives that protect you from contaminated products, often get marked red. Judge a product by its full ingredient list, your own patch test, and how your skin responds.

“Biological age” scores
These are built into rings, watches and longevity apps. The algorithms are proprietary and unpublished, and the number can swing with one bad night’s sleep. Treat it as entertainment.

Apps that turn your lab results or DNA into supplement or skincare plans
If the app sells what it recommends, the advice is marketing. Gene-based diet and skincare apps have the same problem as the DNA kits covered earlier: having a gene doesn’t mean it’s active.

Any health app that won’t tell you who sees your data
Health and cycle data are sensitive. If you can’t easily find out whether an app sells or shares your data, or how to delete it, don’t use it.

The one rule for any app

An app is useful when it either:

• gives you data your doctor can act on (an ECG tracing, a week of blood-pressure readings, a symptom log), or

• helps you keep a habit (sun protection, medication, movement).

If it only gives you a score, it’s probably not worth your attention.

Have a question?

Contact us hello@steinderweisen.co We read every reply, and we answer every single one.

If something here didn’t make sense, or you’d like to know whether a test, an ingredient or a routine is right for your skin, just ask. No question is too small, and you don’t need to have it all worked out first.

What would you like us to cover next?

If there’s a topic you’d like to see in The Dispatch, tell us. It could be an ingredient you keep hearing about, a claim you’re not sure you believe, or a part of midlife skin nobody explains properly. Many of our best issues start with a reader’s question.

The Dispatch, from Steinder Weisen

Midlife health tests

1. The baseline: established and agreed

These tests are cheap and well understood, and their results change care. Your doctor should already be offering them.

Blood tests

• A full blood count

• A metabolic panel (kidneys, liver, electrolytes)

• A lipid panel

• HbA1c and fasting glucose

• TSH (with free T4 if it’s off), ferritin, vitamin D and B12

• Thyroid antibodies (TPO), if your TSH is borderline or thyroid disease runs in your family. Autoimmune thyroid disease is common in women at midlife and can show up as dry skin, thinning hair and fatigue.

Measurements and screening

• Blood pressure, ideally with a validated home cuff (find one at validatebp.org). A week of home readings tells your doctor more than one anxious reading in the clinic.

• Bone density (DEXA), mammogram, cervical screening, colorectal screening from 45, and a yearly skin check with a dermatologist.

• A calcium (CAC) scan, if you’re 40 to 75 and unsure whether you need a statin. A score of zero is genuinely reassuring.

Hormones

Perimenopause is diagnosed by symptoms. FSH and estradiol blood tests are useful only in some cases, because levels swing from day to day. For men, a morning testosterone test, repeated if low.

Fitness

Low aerobic fitness predicts early death as strongly as smoking does. A timed walk or a grip-strength check tells you most of what you need to know, and unlike your genes, fitness responds to training.

Your history

Tell your doctor if you went through menopause before 40, or had preeclampsia or gestational diabetes. Guidelines count these as heart-risk factors, and they’re easy to forget.

On your phone and wrist

• ECG and AFib alerts. The Apple Watch, Samsung Galaxy Watch, Withings ScanWatch and KardiaMobile can record an FDA-cleared single-lead ECG, a simple tracing of the heart’s rhythm, and check it for atrial fibrillation (AFib). AFib becomes more common with age, raises stroke risk and can come and go unnoticed. You can save the tracing as a PDF for your doctor. It can’t detect a heart attack.

• A UV index alert. It’s the most evidence-based skin app there is. Your weather app, or the EPA’s free SunWise app, tells you when UV reaches 3 or above, the point at which sun protection matters, even on cloudy days.

2. Recently changed and worth acting on

These are mostly 2024 to 2026 developments that many doctors haven’t caught up with yet.

• Lp(a), once in your life. This inherited particle raises heart and stroke risk, and your genes largely set its level. Europe has recommended testing everyone for years, and in March 2026 US cholesterol guidelines followed. Many doctors still don’t order it routinely, so ask. Levels can rise after menopause.

• ApoB. This counts the particles that actually build plaque. It is now in US guidelines, especially for people with diabetes, high triglycerides, or a family history of heart disease despite “normal” LDL.

• Your health records in one place. Apple Health Records and similar features in patient-portal apps pull your lab results from different clinics into one timeline, which makes slow trends easy to spot.

• Sleep apnea alerts. Apple and Samsung watches can now flag signs of moderate to severe sleep apnea, which becomes more common after menopause. An alert is a reason to ask for a sleep study, not a diagnosis.

• Blood-pressure alerts on your watch. Apple’s version was cleared by the FDA in September 2025. It’s useful, with a big caveat: the watch never shows a number, and in testing it caught only about 4 in 10 people with high blood pressure. Take an alert seriously, but don’t read no alert as an all-clear. Keep using the cuff.

3. New: interesting, but not proven yet

This is where the science is moving. Read about these, but don’t steer your health by them yet.

• Whole-body biological-age clocks (epigenetic and glycan tests). The research is fascinating, but a single result can move by years between tests, and no one has shown that lowering it makes you healthier. Even Frank Lipman, who runs a longevity clinic, calls these tests “inconsistent, not particularly accurate and not helpful.”

• Multi-cancer blood tests such as Galleri. The first large trial, reported in June 2026, missed its main goal, although it did reduce the number of cancers found at the latest stage. If you take one, it’s an add-on to standard screening, not a replacement.

• Over-the-counter glucose sensors (Dexcom Stelo, Abbott Lingo). Educational for some people, anxiety-inducing for others. There’s no agreed “normal” pattern for people without diabetes.

• Fasting insulin, hs-CRP, homocysteine and the omega-3 index. These are functional-medicine favourites. They’re real measurements and can help in specific situations, but some aren’t standardised between labs, and acting on the results hasn’t been shown to help people who feel well.

• VO2 max estimates from your watch. A reasonable way to track fitness over time, but only an estimate. Follow the trend, not the number.

4. Popular, but skip, and what to test instead

Most of these tests are trying to answer a real question. The trouble is that they answer it badly. For each one, here’s what it’s meant to show, when it’s genuinely useful, and a better-established test for the same question.

MTHFR “methylation gene” test

What it is: A DNA test for common variants in the MTHFR gene, which helps your body process folate. More than half of people in the US carry at least one copy of the most common variant, according to the CDC, so it’s ordinary genetic variation, not a defect.

What it’s sold for: Fatigue, mood, miscarriage, heart risk and “poor detox.” Carriers are often told to buy methylfolate supplements.

When it’s worth it: Almost never for adults. Having the variant doesn’t tell you whether your folate pathway is actually working less well. The American College of Medical Genetics advises against the test, and the CDC says people with the variant process ordinary folic acid fine, including in pregnancy.

Test this instead:

• Homocysteine. If the pathway is struggling, homocysteine builds up. A normal level means the variant isn’t causing a problem.

• B12 and folate, plus methylmalonic acid (MMA) if B12 is borderline. Low B12 is a far more common reason for high homocysteine than MTHFR, especially in midlife, on metformin or acid-reducing medication, or on a plant-based diet.

DUTCH test and other dried-urine or saliva hormone panels

What it is: DUTCH stands for Dried Urine Test for Comprehensive Hormones. You soak filter strips in urine four or five times over a day and post them to a lab. It measures breakdown products of estrogen, progesterone, testosterone, DHEA and cortisol.

What it’s sold for: It claims to show your hormones across a whole day, to reveal which pathway your body uses to break down estrogen (often presented as a breast cancer risk signal), and to map your daily cortisol rhythm (”adrenal fatigue”).

When it’s worth it: Guidelines don’t recommend it for any situation. In perimenopause, hormone levels swing from day to day, so no snapshot (blood, saliva or urine) diagnoses anything or guides treatment. Estrogen breakdown patterns haven’t been validated as a breast cancer risk test. “Adrenal fatigue” isn’t a recognised diagnosis. And if you take oral progesterone, urine results can come out misleadingly high. The Menopause Society advises against saliva and similar hormone testing for managing menopause.

Test this instead:

• For menopause: your symptoms, ideally logged in a tracking app. If you’re under 45, have had a hysterectomy, or your periods have stopped for unclear reasons, blood FSH and estradiol can help.

• For hormone therapy: your doctor adjusts the dose to how you feel. A blood estradiol test is used only occasionally, for example if transdermal estrogen doesn’t seem to be working.

• For cortisol concerns: if your doctor suspects too much cortisol (Cushing’s syndrome), they’ll use a late-night saliva cortisol test, a 24-hour urine cortisol test or a dexamethasone suppression test. If they suspect too little, they’ll use a morning blood cortisol test.

• For breast cancer risk: a family-history risk assessment with your doctor and, if your family history warrants it, BRCA and other genetic testing.

Gut microbiome tests, GI-MAP and stool panels

What it is: DNA sequencing of the bacteria in a stool sample, often packaged with markers of inflammation and digestion.

What it’s sold for: Bloating, skin problems, weight, “leaky gut,” and personalised diets or probiotics.

When it’s worth it: Not for healthy people. An international expert consensus in 2025 concluded these tests aren’t ready for clinical use, and there’s no agreed “healthy” microbiome to compare yours against.

Test this instead, if you have gut symptoms:

• Faecal calprotectin, which separates inflammatory bowel disease from IBS.

• A coeliac blood test (tTG-IgA), done while you’re still eating gluten.

• Stool tests for infection, if you have diarrhoea.

• Breath testing for lactose intolerance or bacterial overgrowth, ordered by a gastroenterologist.

• Colorectal screening from 45.

IgG food sensitivity tests and Cyrex arrays

What it is: Blood tests for IgG antibodies to dozens of foods. Cyrex panels add antibodies to gluten fragments and body tissues.

What it’s sold for: Food intolerances, bloating, skin flares and autoimmunity.

When it’s worth it: Never, for food sensitivities. IgG to a food mostly shows you’ve eaten it. Allergy societies in the US, Europe and Canada all advise against these tests.

Test this instead:

• For suspected allergy (hives, swelling, reactions within minutes): specific IgE blood tests or skin-prick testing with an allergist, guided by your history.

• For suspected coeliac disease: the tTG-IgA blood test, while you’re still eating gluten.

• For intolerance: a structured elimination and reintroduction diet, ideally with a dietitian.

Organic acids tests (OAT)

What it is: A urine test for dozens of breakdown products of metabolism.

When it’s worth it: In one setting: diagnosing rare inherited metabolic disorders, usually in babies and children, by a specialist. As a wellness test for adults, the results aren’t validated.

Test this instead: If the question is B12 status, a single methylmalonic acid (MMA) test answers it.

Whole-body MRI

What it is: A head-to-thigh scan without symptoms, typically $1,000 to $2,500.

When it’s worth it: For people with certain inherited cancer syndromes, such as Li-Fraumeni syndrome, where experts recommend a yearly whole-body MRI. Otherwise, the American College of Radiology says there’s no evidence it saves lives. In studies of people without symptoms, about one scan in six flags something that turns out to be nothing, which can mean more scans and sometimes a biopsy.

Test this instead: Standard screening (mammogram, cervical, colorectal, skin check). If you have a strong family history of cancer, see a genetic counsellor. That’s how you find out whether you’re someone who would genuinely benefit from extra scans.

Subscription panels with 100+ markers

What it is: A yearly or twice-yearly bundle of 100 or more blood tests.

When it’s worth it: If you’re paying for the convenience of getting a targeted list done in one go, and you understand the trade-off. Each normal range is set so that about 1 in 20 healthy people fall outside it, so 100 tests will almost certainly produce several “abnormal” results that mean nothing.

Test this instead: Take the baseline list, plus Lp(a) and ApoB, to your own doctor.

“Biological age” scores from rings and watches

What it is: A single “age” number calculated from your heart rate, sleep and activity data.

When it’s worth it: As entertainment. The algorithms are proprietary and unpublished.

Track this instead: The numbers behind the score that are meaningful on their own: resting heart rate, blood pressure, estimated VO2 max and weekly activity. Watch the trend over months.

Before any test, ask three questions

1. What will it tell us?

2. How reliable is it?

3. How will the result change what we do?

If the answer to the last one is “nothing,” you probably don’t need the test.

Learn more

MTHFR and folic acid (CDC)
MTHFR Gene Variant and Folic Acid Facts: https://www.cdc.gov/folic-acid/data-research/mthfr/index.html
The CDC explains that people with an MTHFR variant can process all forms of folate, including ordinary folic acid, and that how much folic acid you take matters more for your blood folate than your genes do. The most common variant is so widespread that more people in the US carry at least one copy than don’t. The standard advice, 400 mcg of folic acid a day for anyone who could become pregnant, applies whatever your genotype.

IgG food sensitivity tests (allergy societies)
CSACI position statement on food-specific IgG testing: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3443017/
The Canadian allergy society strongly discourages IgG food testing and endorses the matching US and European positions. IgG to a food usually just shows you’ve eaten it. The statement also warns of a real danger: someone with a true food allergy can test “normal” on an IgG panel and be wrongly told the food is safe.

Whole-body MRI for Li-Fraumeni syndrome
Li-Fraumeni Syndrome Association surveillance consensus statement: https://lfsassociation.org/wp-content/uploads/2024/01/LFSA_surveillance_consensus_statement_2022.pdf
Li-Fraumeni syndrome is a rare inherited condition with a very high lifetime cancer risk. Experts recommend a yearly whole-body MRI for people who have it, and studies show this catches most new cancers early enough to treat. It’s the clearest example of whole-body MRI being genuinely worth it: for a specific high-risk group, not as a wellness check-up.

Testing for Cushing’s syndrome (too much cortisol)
Diagnosis of Cushing’s syndrome, Endocrine Society guideline summary: https://csrf.net/doctors-articles/diagnosis/clinical-guideline-on-the-diagnosis-of-cushings-syndrome/
When a doctor suspects Cushing’s syndrome, the guideline recommends one of three validated tests: a late-night saliva cortisol test, a 24-hour urine cortisol test or an overnight dexamethasone suppression test, with abnormal results confirmed before a diagnosis. Saliva cortisol testing is legitimate here because it checks one specific thing (cortisol that fails to drop at night), not a general “adrenal fatigue” profile.

This post is for education only and isn’t medical advice. Talk to your doctor before ordering or acting on any test.