Test ID: ZH357
CPT code: 84120
LOINC:
Specimen Type: 12-mL amber plastic transport tube without preservative
Frequency: 3 – 7 days week days.
Instructions: 2-mL Urine without preservative, Refrigerated Light Protected. Min 1.5 mL.
Text: Evaluate porphyrias, including those involving deficiencies of enzymes that are needed for heme synthesis and chemical porphyrias. In congenital erythropoietic porphyria, elevations of urinary uroporphyrin and coproporphyrin occur, with the former exceeding the latter. In acute intermittent porphyria, porphobilinogen and δ-ALA are elevated in acute attacks.
Methodology: High-pressure liquid chromatography (HPLC) with fluorometric detection