📋 Reference sheet · Reference ranges and unexpected results

Blood results in pregnancy: which ranges change and which tests stop working

Pregnancy shifts some ranges and breaks others. Which is which, trimester by trimester.

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

Reference ranges change in pregnancy

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: Routine Antenatal Care · also Nausea and Vomiting in Pregnancy (NVP) / Hyperemesis Gravidarum (HG), Urinary Tract Infection (UTI) in Pregnancy, Hypertension (HTN) in Pregnancy, Itching in Pregnancy. Part of the GP reference sheets, result interpretation one page per test or finding.