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Porphobilinogen, Quantitative, 24 hour urine

Item Value
Approval req'd? No
Available Stat? No
Test code PBQT24
Test group Porphobilinogen
Performed by Quest
Sendout? Yes
Method Colorimetric
Collection Instructions IMPORTANT: Refrigerate container and protect from light (place in brown paper bag or wrap with aluminum foil) during and after collection.
Container type Brown 24 hour urine collection container

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Amount to Collect Entire 24 hour urine output
Sample type 24 hour urine collection
Preferred volume 10 mL urine
Min. Volume 2 mL urine
UCSF Rejection Criteria Container not refrigerated or protected from light during collection. Urine pH < 4.0
Processing notes Freeze aliquot in dark pour-off container [or wrap container in aluminum foil at -20C. Record total urine volume on the request slip and on the urine container. Order Quest # 762.
Units mg/24 h
Normal range < 2.8 mg/d
Synonyms PBG; Porphyrin precursors; Porphyria
Stability Refrigerated 1 week, frozen at -20C 1 month
Turn around times Test performed Monday-Friday. Turnaround time: 2-3 days.
Additional information To convert mg/d to µmol/d (SI units) multiply by 4.420.

This test should almost always be ordered in conjunction with Aminolevulinic Acid (ALA) analysis on same specimen when the diagnosis of Acute Intermittent Porphyria is being considered.
CPT coding 84110-90
Last Updated 8/22/2013 10:27:23 AM
Entry Number 759
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