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Blood test results

Free T4

The active, unbound form of thyroxine, a main thyroid hormone. Read with TSH to assess how the thyroid is working.

Typical reference range

RangeUnit
11–22 pmol/l

Reference ranges vary between labs and by age, sex, and method — always read your result against the range printed on your lab report.

Educational only — not medical or diagnostic advice. One marker is a single data point; interpret it alongside your history and other results, and consult a qualified clinician about your health.

Track your Free T4 over time in Quanome — it reads your lab reports (PDF or photo) on your device, charts each marker against its range, and an AI coach explains what your trends mean alongside your Apple Health and DNA.

Make sense of all your lab results

Quanome turns your lab reports into a private timeline, each marker tracked against its range, with an AI coach that reads your real numbers. Join the waitlist for early access.