Organ function and inflammation

How the liver and kidneys are coping, and whether there is background inflammation. These organs absorb metabolic strain quietly, which is why they are measured rather than felt.

ALT

A liver enzyme; elevated levels can reflect liver stress.

AST

A liver enzyme, often measured alongside ALT.

GGT

A liver enzyme. It responds to a wider range of liver stress than ALT and AST, which is why it is measured alongside them.

Creatinine

A waste product filtered by the kidneys; used to estimate kidney function.

eGFR

An estimate of how well the kidneys filter the blood.

Cystatin C

A protein filtered by the kidneys. Unlike creatinine it barely depends on muscle mass, so it gives a second, independent read on filtration.

Urine albumin (UACR)

Urine albumin expressed as a ratio to creatinine, which corrects for how dilute the sample was. The guideline measure for kidney strain.

Microalbuminuria

Albumin measured in urine as a concentration. Small amounts leaking through are one of the earliest signs of kidney strain.

hs-CRP

A marker of inflammation, measured with a high-sensitivity assay so it can resolve the low levels that matter for cardiovascular risk.

IL-6

Interleukin-6 — a signalling protein of the immune system, used as a measure of low-grade inflammation.

TNF-α

Tumour necrosis factor alpha — another inflammatory signalling protein, usually read together with IL-6 and hs-CRP.

Which measurements you actually have depends on your devices and your lab results. Watches differ: an older model may never record heart-rate variability, while a newer one may not estimate VO₂max until it has recorded outdoor activity. A measurement you do not have is missing from your device, not missing from you.

Educational information — not medical advice or a diagnosis. Discuss your health with a physician.

← What we measure