ALA Dehydratase, Whole blood

• CPT Code: 82657
• LOINC:
• Specimen Type: Green top
• Frequency: Setup: Mon-Fri; analytic time 2 days
• Instructions: Full green top on wet ice. Send entire specimen, refrigerated. Min 3ml whole blood. Pt to fast 12-14 hrs prior. No alcohol 24hrs prior.
• Text: Useful for confirmation of diagnosis of aminolevulinic acid dehdratase deficiency porphyria (ADP). Strict adherence to collection and handling is required to reduce false positive results. COMPONENTS: Z4478 ALA DEHYDRATASE; Z4479 ALA INTERPRETATION
• Methodology: Enzymatic end point/ spectrofluorometric