Test Code FQPPS Porphyrins, Feces
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 |
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 daysSpecimen Retention Time
1 weekReject Due To
| Specimens in preservative | Reject |