Porphobilinogen, Urine Quant
Test Mnemonic
UPBGQT
CPT Codes
- 82570 - QTY (1)
- 84110 - QTY (1)
Aliases
- PBG, Urine
Includes
- Porphobilinogen, Qn, Random Ur
- Creatinine, U
- PBG/Creatinine Ratio
Performing Laboratory
LabCorp
Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 3 mL | Urine, random | Clean container | Frozen | Patient should avoid excessive fluid intake. Do not collect first morning void or after 8pm. Protect from light. Transfer aliquot to amber transport tube and freeze. |
Minimum Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 1 mL | Does not allow for repeat testing. |
Stability
| Environmental Condition | Description |
|---|---|
| Ambient | Unacceptable |
| Refrigerated | 24 hours (protected from light) |
| Frozen | 1 month (protected from light) |
Days Performed
Varies
Turnaround Time
4 - 7 days
Methodology
| Name | Description |
|---|---|
| Chromatography | |
| Spectrophotometry (S) |
Reference Range
| PBG/Creatinine Ratio | |||||
|---|---|---|---|---|---|
| Sex | Age From | Age To | Type | Range | Range Unit |
| 0.2–2.2 mg/g Creat |
Special Info
Patient should avoid excessive fluid intake. Do not collect first morning void or after 8pm. Protect from light.
Clinical Info
This test is useful to rule out acute intermittent porphyria (AIP) and other acute attack types of porphyrias associated with neurologic and/or psychiatric symptoms. If testing for an acute porphyria, please consider ordering PBG, Screen (SQUPBG). If testing for a cutaneous porphyria, please consider ordering Porphyrins, Urine (SQUPORFR). If testing for erythropoietic porphyria, please consider ordering Total Erythrocyte Porphyrins (SQPROPOR).