8 days
High-pressure liquid chromatography (HPLC) with fluorometric detection
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Porphyrin test. Elevated in porphyria and lead poisoning.
24 hour urine, protected from light
2 mL aliquot
12 mL amber plastic transport tube without preservative
No special preparation is required for this test. You may eat, drink, and take your medications as normal, unless instructed otherwise by your healthcare provider.
Protect from light - Instruct patient to void at 8 AM (or 8 PM) and discard the specimen. Then collect all the urine including the final specimen voided at the end of the 24-hour collection period (ie, 8 AM (or 8 PM) the following day). Specimen must be kept refrigerated during collection. Label container with patient&apos,s name, and date and time collection started and finished. Measure and record total urine volume. Mix well, send aliquot to laboratory.
| Temperature | Period |
|---|---|
| Refrigerated | 7 days |
| Frozen | 14 days |
| Freeze/thaw cycles | stable x3 |