Liver
Alkaline Phosphatase
LOINC 6768-6 · U/L
Ranges
Reference range: 44–147 U/L
What it is
Alkaline phosphatase (ALP) is an enzyme found mainly in the liver and bones. It is part of standard liver testing.
Why it matters
Its level helps assess the liver and bile ducts, and sometimes bone activity.
What high values can mean
A higher value can reflect blocked bile flow, liver conditions or increased bone turnover; it is also higher during growth and pregnancy.
What low values can mean
A lower value is less common and is usually interpreted in context.
How to improve it
Care addresses the underlying liver or bone cause rather than the number itself.
Food & lifestyle
No specific food changes ALP; supporting liver health and bone-friendly habits is sensible overall.
Preparing for the test
Often part of a liver panel; fasting is sometimes requested — follow your lab's instructions.
When to talk to a doctor
An abnormal ALP is interpreted by a doctor with GGT and other liver tests to find the source.
Related markers
Sources
- MedlinePlus (NIH)
- Testing.com (AACC)
Content reviewed on June 26, 2026
Medical disclaimer
This content is for educational purposes only. It is not medical advice and does not diagnose, treat, or prevent any condition. Reference ranges vary between laboratories — always use the range printed on your report and discuss your results with a healthcare professional.
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