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Also known as: Alkaline phosphatase; alk phos

At a Glance

Why Get Tested?

To screen for or monitor treatment for a liver or bone disorder

When to Get Tested?

As part of liver function tests or when a person has symptoms of a liver or bone disorder

Sample Required?

A blood sample drawn from a vein in the arm

The Test Sample

What is being tested?

Alkaline phosphatase is an enzyme found in high levels in bone and liver. Smaller amounts of ALP are found in pregnant women (in whom ALP is produced by the placenta), and in the intestines. Each of these body parts makes different forms of ALP.

How is the sample collected for testing?

A blood sample is taken by needle from a vein in the arm.

The Test

Common Questions

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NOTE: This article is based on research that utilizes the sources cited here as well as the collective experience of the Lab Tests Online Editorial Review Board. This article is periodically reviewed by the Editorial Board and may be updated as a result of the review. Any new sources cited will be added to the list and distinguished from the original sources used.