📋 Reference sheet · Liver and gut

Low or borderline 9 am cortisol

A 9 am cortisol at the bottom of the range. When that needs a short synacthen and when it does not.

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: Addison's Disease · also Oral Corticosteroid Use and Withdrawal. Part of the GP reference sheets, result interpretation one page per test or finding.