Creatinine (serum and urine), Creatinine Clearance (calculation), eGFR
(Specimen Container)
10 mL aliquot from a well-mixed, 24h urine collection no preservative. And 1 Serum Separator Tube
(Transport Temperature)
| Temperature | Period |
|---|---|
| Room temperature | 72 hours |
| Refrigerated | 7 days |
| Frozen | 30 days |
Grossly icteric serum
Record total volume and collection duration on specimen container and test requisition. Indicate the patient’s height (in feet and inches) and weight (in lbs.) on test requisition. Note: A serum creatinine level must be collected within 24 hours of the beginning or ending of the urine collection in Serum Separator Tube (SST®). Transported Room Temperature.
Creatinine Clearance is used to evaluate the glomerular filtration rate (GFR). Clearance is defined as that volume of plasma from which a measured amount of substance could be completely eliminated into the urine per unit of time. Daily creatinine production is fairly constant except when there is massive injury to muscle.
80 – 120 mL/min
