PORPHOBILINOGEN, 24 HOUR URINE

Specimen Required
Collect 24 hour urine in an IATA-approved sterile screw-capped plastic container, protected from light. Keep refrigerated during collection. Send a 10 mL urine aliquot (2 mL minimum) refrigerated in a screw-capped plastic container. PROTECT FROM LIGHT. Provide 24 hour urine volume.

Alternate Specimen
10.0 mL urine from a 24 hour collecito can be alkalinized with sodium carbonate (5g Na2CO3) to a pH or 6-7. Send refrigerated and protected from light.

Rejection Criteria
Received room temperature, not protected from light, pH <4.0.

Methodology
Colorimetric

Stability
Room temperature: Unacceptable; Refrigerated: 7 days; Frozen: 1 month

Reference Range
24 hour Porphobilinogen: <2.4 mg/24 hr
Creatinine: By report

Performed
Quest SJC

Turnaround Time3-8 days
Test CodeUPBGQ
CPT-4 Code (s)
84110
LOINC Codes
Total Volume:   3167-4  
Porphobilinogen, 24 Hr Ur   :2810-0  
Interpretation   :48767-8  

Warde
Medical
Laboratory