📋 Reference sheet · Reference ranges and unexpected results

The lab has phoned: acting on a critical result

The lab is on the phone. Which numbers are an emergency on their own, and what to do if you cannot reach the patient.

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: Sepsis: recognition, diagnosis and early management · also Neutropenic Sepsis, Hyponatraemia, Hyperkalaemia. Part of the GP reference sheets, result interpretation one page per test or finding.