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HelpTest Code UPGC Uroporphyrinogen III Synthase (Co-Synthase), Erythrocytes
Reporting Name
Uroporphyrinogen III Synthase, RBCUseful For
Diagnosis of congenital erythropoietic porphyria
This test is not useful for diagnosis of acute intermittent porphyria (AIP).
Method Name
High-Performance Liquid Chromatography (HPLC)
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Specimen Type
WB HeparinOrdering Guidance
This test is most appropriately used for pediatric patients.
This test measures uroporphyrinogen (UPG) III synthase to confirm congenital erythropoietic porphyria, which is typically seen in early infancy. It does not measure UPG I synthase (also known as porphobilinogen deaminase), the enzyme deficient in acute intermittent porphyria (AIP). For AIP (and UPG I synthase), order PBGD_ / Porphobilinogen Deaminase, Whole Blood.
Necessary Information
1. Include a list of medications the patient is currently taking.
2. Date of transfusion, if performed
Specimen Required
All porphyrin tests on erythrocytes can be performed on one collection tube.
Patient Preparation: Patient must not consume any alcohol for 24 hours before specimen collection.
Container/Tube: Green top (sodium or lithium heparin)
Specimen Volume: 4 mL
Collection Instructions: Immediately place specimen on wet ice.
Specimen Minimum Volume
3 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| WB Heparin | Refrigerated | 7 days |
Reject Due To
| Gross hemolysis | Reject |
Special Instructions
Day(s) Performed
Wednesday
CPT Code Information
82657
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| UPGC | Uroporphyrinogen III Synthase, RBC | 11066-8 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| 80288 | Uroporphyrinogen III Synthase, RBC | 11066-8 |
Clinical Information
The porphyrias are a group of inherited disorders resulting from enzyme defects in the heme biosynthetic pathway. Congenital erythropoietic porphyria (CEP) is an extremely rare, autosomal recessive porphyria that typically presents in early infancy. Also known as Gunther disease, CEP results from a deficiency of uroporphyrinogen III (co-) synthase (UROIIIS). In most cases, the disorder is suggested during the first few days or weeks of life by pink, violet, or brown urinary staining of diapers. Clinical symptoms include hemolytic anemia, hepatosplenomegaly, skin photosensitivity, scarring and blistering, red or brown dental discoloration (erythrodontia), and hypertrichosis (excess body hair). Growth and cognitive developmental delays are commonly observed in individuals with CEP. A few cases of adult-onset CEP have been reported, typically associated with a myelodysplastic syndrome.
The workup of patients with a suspected porphyria is most effective when following a stepwise approach. Molecular confirmatory testing is available on a clinical basis; order CGPH / Custom Gene Panel, Hereditary, Next-Generation Sequencing, Varies; specify UROS Gene List ID: IEMCP-8W4945. For more information see Porphyria (Cutaneous) Testing Algorithm or call 800-533-1710 to discuss testing strategies.
Specimen Retention Time
14 daysTest Classification
This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. It has not been cleared or approved by the US Food and Drug Administration.Genetics Test Information
This test is not appropriate for assessment of acute abdominal pain.
Report Available
3 to 9 daysForms
1. New York Clients-Informed consent is required. Document on the request form or electronic order that a copy is on file. The following documents are available:
-Informed Consent for Genetic Testing (T576)
-Informed Consent for Genetic Testing-Spanish (T826)
2. If not ordering electronically, complete, print, and send a Biochemical Genetics Test Request (T798) with the specimen.