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Porphobilinogen, Quantitative, 24 hour urine
| Item | Value |
|---|---|
| Approval req'd? | No |
| Available Stat? | No |
| Test code | PBQT |
| 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 Click here for Urine Preservative Requirements |
| 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 | 3/24/2013 7:52:09 PM |
| Entry Number | 759 |
If you have additional questions regarding this test, please call: 415-353-1667