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HelpPorphyrins, Feces
Reporting Name
Porphyrins, FClinical System Name: Miscellaneous Test
Useful 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 dominant protoporphyria
Necessary 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 collection and during the entire specimen collection period, patient must refrain from eating red meat and or taking any aspirin-containing medications.
2. Patient should not use barium, laxatives, or enemas for 24 hours before starting, as well as during, specimen collection.
Collection Container/Tube: Stool Containers - 24, 48, 72 Hour Kit (T291). No preservative.
Specimen Volume: Entire collection (48, 72, or 96 hour). 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:
1. Length of collection period is required.
2. Specimens smaller than 100 g may not provide accurate results.
3. Include a list of medications the patient is currently taking.
Specimen Type
FecalSpecimen Minimum Volume
See Specimen Required
Specimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| Fecal | Frozen (preferred) | 14 days |
| Refrigerated | 14 days |
Day(s) Performed
Monday, Thursday
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Method Name
High-Performance Liquid Chromatography (HPLC)
Method Description
The porphyrins are separated according to numbers of carboxyl units and isomer status. Analytic specificity is based on the combination of chromatographic behavior and the uniqueness of the porphyrins among substances in human specimens in terms of fluorescence spectra. Components quantified are 10 specific porphyrins of isomer series I and III, 4 groups of "isoporphyrins" (isomers other than of series I and III), and protoporphyrin.(Unpublished Mayo method)
Reference Values
UroporphyrinI:
<120 mcg/24 h
Uroporphyrin III:
<50 mcg/24 h
Heptacarboxyl porphyrin I:
<40 mcg/24 h
Heptacarboxyl porphyrin III:
<40 mcg/24 hours
Isoheptacarboxyl porphyrins:
<30 mcg/24 h
Hexacarboxnyl porphyrin:
<10 mcg/24 h
Hexacarboxnyl porphyrin III:
<10 mcg/24 h
Isohexacarboxnyl porphyrins :
<10 mcg/24 h
Pentacarboxyl porphyrin I:
<20 mcg/24 hours
Pentacarboxyl porphyrin II:
<20 mcg/24 h
Isopentacarboxyl porphyrins:
<80 mcg/24 hours
Coproporphyrin I:
<500 mcg/24 h
Coproporphyrin III:
<400 mcg/24 h
Isocoproporphyrin:
<200 mcg/24 h
Protoporphyrins:
<1,500 mcg/24 h
Coproporphyrin III/Coproporphyrin I RATIO:
<1.20
Test 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.CPT Code Information
84126
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| FQPPS | Porphyrins, F | 94548-5 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| W6 | Total weight | 30078-0 |
| TM70 | Collection Duration | 13363-7 |
| 15517 | Uroporphyrin I | 26691-6 |
| 15518 | Uroporphyrin III | 33585-1 |
| 15519 | Heptacarboxyl I | 49900-4 |
| 15520 | Heptacarboxyl III | 49901-2 |
| 15521 | Isoheptacarboxyl | 94549-3 |
| 15522 | Hexacarboxyl I | 94550-1 |
| 15523 | Hexacarboxyl III | 94551-9 |
| 15524 | Isohexacarboxyl | 94552-7 |
| 15525 | Pentacarboxyl I | 33623-0 |
| 15526 | Pentacarboxyl III | 33624-8 |
| 15527 | Isopentacarboxyl | 94553-5 |
| 15528 | Coproporphyrin I | 23845-1 |
| 15529 | Coproporphyrin III | 23846-9 |
| 15530 | Isocoproporphyrin | 33625-5 |
| 15534 | Protoporphyrin | 2891-0 |
| 15545 | CoproIII/CoproI ratio | 33618-0 |
| 81652 | Interpretation (FQPPS) | 59462-2 |
| 35013 | Reviewed By | 18771-6 |
Special Instructions
Report Available
3 to 6 daysReject Due To
| Specimens in preservative | Reject |
Forms
If not ordering electronically, complete, print, and send a Biochemical Genetics Test Request (T798) with the specimen.