CPT® Code 82657

The CPT® Code 82657 refers to a laboratory test that assesses enzyme activity in blood cells, cultured cells, or tissue using a nonradioactive substrate. This test is crucial for monitoring enzyme function, which can be significantly impacted by genetic mutations affecting the proteins responsible for various bodily functions. Enzymes play a vital role in the breakdown and transportation of essential compounds within the body, as well as in the activation and protection of physiological processes. By evaluating enzyme activity in samples such as blood or tissue, healthcare professionals can aid in the diagnosis of certain inherited genetic disorders. For instance, a blood sample is typically collected through a procedure known as venipuncture, which is separately reportable. The applications of CPT® Code 82657 include specific tests such as measuring thiopurine methyltransferase levels in red blood cells to identify individuals at risk for myelosuppression when treated with thiopurines, assessing porphobilinogen (PBG) deaminase activity in whole blood to screen for intermittent porphyria, and quantifying alpha-galactosidase in serum to diagnose Fabry disease in males. Additionally, this code is utilized for examining small bowel tissue for disaccharidase activity through quantitative spectrophotometry, with tissue samples obtained via a separately reportable endoscopy procedure.