Free T4 in perimenopause
The active thyroid hormone reserve, unaffected by binding proteins.
- Panel
- Thyroid
- LOINC
- 3024-7 (verified against loinc.org)
- US unit
- ng/dL
- UK/EU unit
- pmol/L
Why it's on the midlife checklist
The follow-on thyroid number — the circulating hormone itself, free of binding-protein noise. Usually drawn when TSH raises a question; together they frame the thyroid conversation.
Keeping the record
Log it alongside the TSH from the same draw so the pair stays together — thyroid numbers are read as a set, and split records get misread.
Source
- Checklist adapted from the Menopause Empowerment Guide (Dr. Mary Claire Haver) — labs to discuss with your clinician, in addition to standard CBC/CMP.
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Educational content, written and maintained by Perity (founder: EiEi), grounded in the sources cited on this page. It is not medical advice, and Perity never interprets your data or recommends treatment. Last reviewed 2026-07-09.
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