FIB-4 liver fibrosis index
Advanced· every few years
What it measures
A calculation from age, AST, ALT, and platelet count used to summarize the chance of liver scarring.
Why it's discussed for longevity
Derived from values a basic panel already includes, so it adds no separate draw; commonly used as a first look at liver fibrosis.
Source: NIDDK (NIH)Related tests in this area
- Kidney function (eGFR, cystatin C)How well the kidneys filter blood, estimated from creatinine…
- Liver enzymes (ALT, AST, GGT)Enzymes that describe how the liver is doing.…
- Urine albumin-to-creatinine ratio (uACR)A small amount of albumin in the urine, compared with creati…
- Liver elastography (FibroScan)Liver stiffness, measured with a quick ultrasound-based scan…