Two specimens required. SERUM: One 7.5 mL serum separator tube (SST) for the serum creatinine. NOTE: The serum specimen must be obtained within 24 hours of the start or stop time of the urine collection. URINE: 24-hour collection preferred, or a minimum 4-hour collection is accepted. Refrigerate during collection, handling, and transport. Do not add preservatives. Note time collection started and stopped, and the patient’s height and weight on the requisition.
Centrifuge SST and transport in original tube. Send complete urine collection in original container. Patient’s height and weight information MUST be sent with specimens. A 25 mL aliquot of the urine may be submitted by following this protocol: Mix the entire urine collection well, measure and record the total volume. Pour aliquot of urine into sterile container.
Total urine collection or 25 mL aliquot, AND 2 mL serum.
5 mL urine AND 0.5 mL serum.
Incomplete urine collection; specimen not refrigerated.
Results vary for age and sex. See individual components.