📋 Reference sheet · Liver and gut

Abnormal TFTs: TSH and free T4

TSH and free T4 disagree. Read them together, and know what pregnancy and amiodarone do to both.

One page, every threshold with its number and unit. Written and reviewed by practising UK GPs. Last reviewed 29 Jul 2026.

This sheet puts the whole decision on one page: the thresholds that change what you do, each with its number and unit, and the sources each one was checked against.

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Inside the full sheet 🔒 Thresholds, numbers and units 🔒 Sources checked against the guideline

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Related Ocean Article: Hypothyroidism · also Thyroid Enlargement and Suspected Thyroid Cancer, Subclinical Hyperthyroidism, Subclinical Hypothyroidism, Hyperthyroidism. Part of the GP reference sheets, result interpretation one page per test or finding.