| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # |
Porphyrins, Fractionated, Quantitative, Random Urine
Test Code36592
CPT Codes
84120
Includes
Coproporphyrin I, Coproporphyrin III, Heptacarboxyporphyrin, Hexacarboxyporphyrin, Pentacarboxyporphyrin, Uroporphyrin I, Uroporphyrin III, Total Porphyrins
Preferred Specimen
2 mL random urine in 5 grams sodium carbonate (Na2CO3) container - protected from light
Minimum Volume
1.5 mL
Other Acceptable Specimens
Unpreserved random urine submitted in a plastic leak-proof container (light protected) • Unpreserved catheterized or first void clean catch or random clean catch urine (light protected)
Instructions
Random urine collected with 5 grams of sodium carbonate, refrigerated, and protected from light during collection is preferred. Collection with no preservative is acceptable, if properly refrigerated and light protected.
Transport Container
Transport Temperature
Refrigerated (cold packs) - ok to thaw
Specimen Stability
Room temperature: Unacceptable
Refrigerated: 7 days
Frozen: 30 days
Refrigerated: 7 days
Frozen: 30 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Received room temperature • Samples not protected from light • Samples with a pH <4.0
Methodology
High Performance Liquid Chromatography (HPLC)
Setup Schedule
Set up: Sun, Tues-Fri; Report available: 5-7 days
Reference Range
| Uroporphyrin I | 3.6-21.1 mcg/g creat |
| Uroporphyrin III | ≤5.6 mcg/g creat |
| Heptacarboxyporphyrin | ≤3.4 mcg/g creat |
| Hexacarboxyporphyrin | ≤6.3 mcg/g creat |
| Pentacarboxyporphyrin | ≤4.1 mcg/g creat |
| Coproporphyrin I | 6.5-33.2 mcg/g creat |
| Coproporphyrin III | 4.8-88.6 mcg/g creat |
| Total Porphyrins | 27.0-153.6 mcg/g creat |
Clinical Significance
Porphyria is a group of distinct disorders, characterized by the abnormal accumulation of porphyrins or porphyrin precursors. Porphyrin fractionation of urine is useful in diagnosing porphyrin cutanea tarda, hereditary coproporphyria, and variegate porphyria.
Performing Laboratory
| Quest Diagnostics Nichols Institute-San Juan Capistrano, CA |
| 33608 Ortega Highway |
| San Juan Capistrano, CA 92675-2042 |
