Test Details

Mnemonic

UPBGQ

Ordering Code

3426500

CPT-4 Code(s)

84110, plus 81050 if volume performance completed

Specimen Information

Collect

24 hour urine (refrigerate and protect from light during collection)

Specimen Preparation

Collect 24 hour urine in a screw capped plastic container, PROTECT FROM LIGHT. Add 5 g sodium carbonate (Na2CO3) at the start of the collection to maintain a pH of 6 - 7. Refrigerated during collection. Send a 2.0 mL preserved urine. Provide 24 hour urine volume.

Alternate Specimen

24 hour urine (no preservative) in screw capped container. Send 2.0 mL urine refrigerated. PROTECT FROM LIGHT.

Minimum Volume

1.0 mL

Transport Temperature

Refrigerated

Rejection Criteria

Received room temperature, not protected from light

Stability

Room temperature: Unacceptable
Refrigerated: 7 days
Frozen: 30 days

Methodology

Chromatography/Mass Spectrometry
more

Reference Range

24 hour Porphobilinogen:
Adult: <0.34 mg/24 hr
Pediatric: Not Established
more

Performing Laboratory

Quest SJC
more