Tartrate resistant acid phosphatase test

Alternative Names

Type 5b acid phosphatase test; TRAP test

Definition of Tartrate resistant acid phosphatase test

Tartrate resistant acid phosphatase (TRAP) is a test performed on blood cells or bone marrow (biopsy) to confirm a diagnosis of hairy cell leukemia. This test can also be done on blood plasma to look for signs of bone breakdown.


David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine; Yi-Bin Chen, MD, Leukemia/Bone Marrow Transplant Program, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc. – 6/2/2010

ADAM Medical Encyclopedia

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