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HelpTest Code LAB9745 Porphyrins, Feces
Additional Codes
FQPPS
Reporting Name
Porphyrins, FUseful For
Evaluation of patients who present with signs or symptoms suggestive of porphyria cutanea tarda, hereditary coproporphyria, variegate porphyria, congenital erythropoietic porphyria, erythropoietic protoporphyria, or X-linked protoporphyria
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Specimen Type
FecalNecessary Information
1. Weight of the non-homogenized sample
2. Collection duration
3. Include a list of medications the patient is currently taking.
4. Indicate if patient was compliant with the patient preparation requirements.
Specimen Required
Patient Preparation:
1. For 3 days before, as well as during, specimen collection, patient must not eat red meat or take any aspirin-containing medications.
2. For 24 hours before, as well as during, specimen collection, patient must not use barium, laxatives, or enemas.
Supplies: Stool Containers - 24, 48, 72 Hour Kit (T291)
Container/Tube: Stool containers
Specimen Volume: Entire collection (48, 72, or 96 hours). 24-Hour collection is adequate if the collection volume is at least 100 g
Collection Instructions:
1. Collect all stool specimens within a 24, 48, 72, or 96-hour timeframe.
2. Do not add preservative.
3. Send entire collection.
Additional Information: Specimens smaller than 100 g may not provide accurate results.
Specimen Minimum Volume
See Specimen Required
Specimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| Fecal | Frozen (preferred) | 14 days |
| Refrigerated | 14 days |
Special Instructions
Reference Values
Uroporphyrin I: <120 mcg/24 h
Uroporphyrin III: <50 mcg/24 h
Heptacarboxyl I: <40 mcg/24 h
Heptacarboxyl III: <40 mcg/24 hours
Isoheptacarboxyl: <30 mcg/24 h
Hexacarboxyl I: <10 mcg/24 h
Hexacarboxyl III: <10 mcg/24 h
Isohexacarboxyl: <10 mcg/24 h
Pentacarboxyl I: <20 mcg/24 hours
Pentacarboxyl III: <20 mcg/24 h
Isopentacarboxyl: <80 mcg/24 hours
Coproporphyrin I: <500 mcg/24 h
Coproporphyrin III: <400 mcg/24 h
Isocoproporphyrin: <200 mcg/24 h
Protoporphyrin: <1,500 mcg/24 h
CoproIII/CoproI ratio: <1.20
Day(s) Performed
Monday, Thursday
CPT Code Information
84126
Report Available
3 to 6 daysReject Due To
| Specimens in preservative | Reject |
Method Name
High-Performance Liquid Chromatography (HPLC)
Forms
If not ordering electronically, complete, print, and send a Biochemical Genetics Test Request (T798) with the specimen.