CPT® 84433, Under Chemistry Procedures

The Current Procedural Terminology (CPT®) code 84433 as maintained by American Medical Association, is a medical procedural code under the range - Chemistry Procedures.

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Code 84433 describes a test for thiopurine S–methyltransferase (TPMT) levels in a blood specimen. TPMT is an enzyme that can be inhibited by thiopurine drugs, possibly resulting in myelosuppression (decreased blood cell formation by bone marrow). Clinicians may test TPMT levels before prescribing thiopurine drugs to avoid this risk.

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