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Leukocyte Alkaline Phosphatase Stain (LAP)

Optimizing Laboratory Testing for Hematologic
Disorders Series

LAP: A Test That Time Has Passed By

Slide 4

September 2010

Today we will be talking about leukocyte alkaline phosphatase stain, or LAP, as a test that time has truly passed by. Occasionally the LAP may be confused with other tests. The LAP is not a serum alkaline phosphatase which is used to evaluate liver, bone, intestinal, and other diseases. Another test that is sometimes mistakenly confused with the LAP is leucine aminopeptidase. This enzyme is marketed as a potential useful marker of hepatic function and may be abnormal in some cancers. Both of these assays may be the intended goal of the clinician, but by mistake, a LAP is ordered instead.

A Test That Time Has Passed By


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