Biomarkers & Testing

GGT is a useful liver enzyme signal, but it cannot diagnose disease or rank your longevity. Read it with the wider panel and clinical context.

Homocysteine can flag B-vitamin, kidney, and vascular risk signals, but the evidence does not make it a standalone longevity score or treatment target.

The omega-3 index measures EPA and DHA in red blood cells, but it is not a stand-alone heart score. Here is what the biomarker shows and what it cannot.

NT-proBNP rises when the heart is under strain. The test is most useful for suspected heart failure, not as a routine longevity score for healthy adults.

Resting heart rate is a useful signal, but not a verdict. The number shifts with fitness, stress, illness, medicines, and how you measure it.

RDW can add context to blood-count results and ageing-risk research, but it is a non-specific signal that needs careful clinical interpretation.

Ferritin can clarify iron stores, but low or high results need clinical context, repeat testing, and caution with supplements or iron-overload concerns.

Urine ACR can reveal kidney and vascular risk that blood tests may miss, but results need repeat testing, eGFR, and careful clinical context.

Cystatin C can sharpen kidney-risk assessment when creatinine is noisy, but it is a context marker for clinical decisions, not a longevity score.

hs-CRP can add useful context to cardiovascular risk discussions, but it is an inflammation signal, not a diagnosis or a reason to self-medicate.