Useful for: Evaluate porphyrias, including those involving deficiencies of enzymes which are needed for heme synthesis and chemical porphyrias.
Mix 24 hr collection well.
Measure and record total urine volume.
Transfer a 2mL (minimum 1.5mL) aliquot into a LabCorp amber plastic transport tube with cap.
Label with patient name and 2nd ID, source and total volume.
If amber transport tubes are unavailable, cover transport tube completely, top and bottom, with aluminum foil. Identify specimen with patient's name directly on the amber transport tube AND on the outside of the aluminum foil and secure with tape.
Specimen must be kept refrigerated during transport.
High-pressure liquid chromatography (HPLC) with fluorometric detection