Question 70 of 433
IGF-1, uric acid, cystatin C, and GGT?
The short answer
One of the four is clearly useful.
Cystatin C: WORTH IT in the right person. It gives a truer reading of kidney function when the usual creatinine test is distorted, as it is in very muscular people, frail people, and anyone taking creatine.
Uric acid: useful for gout. Treating a high level without symptoms has not been shown to help.
IGF-1: used to diagnose growth hormone disorders. Both low and high levels are linked to higher mortality, so there is no “optimal” target.
GGT: a nonspecific liver and alcohol marker.
“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
GUIDELINE / VALIDATION — Selected patients: cystatin C refines kidney assessment; the other markers require specific indications.Evidence grade (draft mapping)GGuideline-based / consensusPart 5, Q70 · 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.