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How often should you actually retest?

Dr. Marcus Bell

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4 min read

A simple schedule: annually if things are steady, twelve weeks after any change worth measuring.

Jul 1, 2026

4 min read

Dr. Marcus Bell

The honest answer is less often than most testing companies would like. Markers move at different speeds, and retesting faster than a marker can change tells you nothing except how much noise your assay has.

A workable rhythm

A full panel once a year is enough for most healthy adults. After starting a supplement, a medication or a serious training block, retest the specific markers at twelve weeks — long enough to move, short enough to act.

The exceptions

Ferritin after iron therapy, HbA1c after a metabolic change, and thyroid after a borderline result all deserve their own timeline. Lp(a) you measure once and never again.

Your report always names the markers worth rechecking and when — so you are not guessing between appointments.

Dr. Marcus Bell

Longevity medicine, Verdia

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