Question 369 of 433
Are the blood-test subscriptions worth it?
The short answer
They are a cheap way to get many tests and an unreliable way to get healthier. The value depends entirely on what you do with the results, and on not being frightened by the noise.
The best known sells more than 160 lab tests a year for $365 and reported about 200,000 members in 2025. Competitors charge $99 to $500. Fitness trackers and telehealth companies now sell similar panels. The laboratory work itself is done by the same national labs your doctor uses, and it is accurate.
The problem is arithmetic. A “normal range” is defined to include 95 percent of healthy people. For a test using such an interval, about 5 percent of comparable healthy results fall outside it. Not every test uses that definition, and an out-of-range result is not necessarily a diagnostic false positive. Run 20 independent tests and the chance of at least one false flag is about 64 percent. Run 100 such independent tests and it is over 99 percent. Real panels contain correlated tests and decision thresholds, so this is an illustration of multiplicity, not a measured false-positive rate for a named service. Each flag invites another test, a supplement, or a worry.
A large review of general health checkups in healthy adults found they did not reduce deaths. More data is not the same as more health.
My advice: if you use one of these services, focus on the dozen or so results that matter (they are listed in Parts 4 and 5), bring them to a physician who knows you, and ignore the mildly out-of-range values that have no meaning. Test before you guess, but do not test everything.
“This book is for education. It is not medical advice, and reading it does not make you my patient or create a doctor-patient relationship.” From the book’s medical disclaimer. Full disclaimer
PROBABILITY MODEL / HUMAN REVIEW — Large panels produce incidental flags; no demonstrated mortality benefit from indiscriminate general checks.Evidence grade (draft mapping)Grade pendingPart 25, Q369 · Part sources
From Longevity Unmasked by Afshine Ash Emrani, MD, FACC. Medical disclaimer. This book is for education. It is not medical advice, and reading it does not make you my patient or create a doctor-patient relationship. Nothing here is meant to diagnose, treat, cure, or prevent any disease. Medicine is personal: a test, drug, supplement, or exercise plan that helps one person can harm another. Do not start, stop, or change any medication or treatment because of something you read in these pages. Talk with a licensed clinician who knows your history first. If you think you are having a medical emergency, call 911. The author disclaims responsibility for any loss or harm arising from use of the information in this book.