1-5 days after setup at PeaceHealth Laboratories’ reference lab.
Specimen Collection Details
24-hour urine in a clean, dry plastic container. Refrigerate during collection.
Adequate refrigeration is the most important aspect of preservation. Preservation can be enhanced by adjusting pH to 2.0-4.0 using 6 mol/L HCl. pH less than 2.0 will decrease stability.
Specimen stable 4 hours ambient, 14 days refrigerated, or 1 month frozen.
5 mL aliquot from a well mixed 24-hour urine collection.
3 mL aliquot from a well mixed 24-hour urine collection.
Refrigerated; or if frozen, on dry ice.
81 years and older
51 years and older
A large number of substances may interfere with this test. Decreases may be caused by carbamazepine, cephaloridine, cephalothin, chlormerodrin, digoxin, glucose, metyrapone, promazine, propoxyphene, reserpine, and others. Increases may be caused by acetone, acetophenide, ascorbic acid, chloramphenicol, chlorothiazide, chlorpromazine, cloxacillin, dexamethasone, erythromycin, ethinamate, etryptamine, methicillin, methyprylon, morphine, oleandomycin, oxacillin, penicillin, phenaglycodol, phenazopyridine, phenothiazine, piperidine, quinidine, secobarbital, spironolactone, and others.