24 hours after setup at PeaceHealth Laboratories’ reference lab.
Specimen Collection Details
24-hour urine in acid-washed container with 10 mL 6 M hydrochloric acid (HCl) added at start of collection. Specimen must be refrigerated during collection. Also acceptable; Random specimen acidified with 6M HCl. Preservative can be added at end of collection only if specimen has been refrigerated entire time.
Adjust pH to less than or equal to 2.0 with 6M HCl. Aliquot into a clean, dry plastic container. Refrigerate or freeze.
Specimen stable 8 hours ambient, 7 days refrigerated, or indefinitely if frozen.
4 mL aliquot from a 24-hour urine collection or total random collection.
0.5 mL aliquot from a 24-hour urine collection.
Refrigerated; or if frozen, on dry ice.
Specimen containing drug that causes alkalemia or acidemia.