8 days
Column chromatography, Ehrlich reagent − spectrophotometry
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Assesses levels of ALA, a precursor in heme synthesis. Elevated in porphyrias and lead poisoning.
Random Urine, protected from light
3 mL
Plastic urine container with 0.5 mL of 30% acetic acid AND AMBER plastic frozen transport tube and cap
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.
On collection of random urine, it is advisable NOT to use first voided morning specimen, late evening specimen after 8 PM, or specimen obtained following excessive fluid intake. pH must be <,7. Transfer the urine into a LabCorp AMBER plastic frozen transport tube with amber cap (LabCorp No. 78656). Label the container with the patient&apos,s name and date. The specimen should be FROZEN immediately and maintained frozen until tested. (If amber tube and cap are not available, cover a clear plastic transport tube COMPLETELY from top to bottom with aluminum foil. Identify the specimen with the patient&apos,s name directly on the transport tube AND the outside of the aluminum foil. Secure with tape.) To avoid delays in turnaround time when requesting multiple tests on frozen samples, PLEASE SUBMIT SEPARATE FROZEN SPECIMENS FOR EACH TEST REQUESTED.
| Temperature | Period |
|---|---|
| Frozen | One month when preserved with 30% glacial acetic acid and frozen (-20°C to 0°C) |