Alpha Medical Lab
Creatinine Clearance Urine 24hr
Ordered Test Code:
CC24
| Lab Test Component | Requirement |
|---|---|
| Test Name | Creatinine Clearance Urine 24hr |
| Alpha’s Order Test Code | CC24 |
| Specimen Collection Tube | 24hr Urine Conatiner/10mL and SST/ 1mL |
| Collection Tube Handling | Acidified urine • Urinalysis transport tube (yellow-top, blue fill line, preservative tube) • Serum collected in: Spun Serum Separator Tube (SST®) • Plasma collected in: Sodium heparin (green-top) tube or lithium heparin (green-top) tube |
| Minimum Volume | 0.5 mL urine / 0.5 mL serum |
| Transport Temperture | Room Temp |
| Stability | Serum and urine: Room temperature: 7 days; Refrigerated: 7 days; Frozen: 28 days |
| Collection Instructions | “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.” |
Clinical Significance
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.
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