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Test Code Creat Cl Creatinine Clearance

Patient Preparation

No special patient preparation required

Special Collection Instructions

Requires the following:

  • Collection of serum/plasma creatinine during time of 24 hour urine collection

  • Patient’s current height in centimeters and current weight in kilograms to be entered by the ordering personnel at the time the test is ordered in the lab computer system.

Collection Method

24 Hour urine collection and Serum creatinine

Container

24 hour urine container
AND


Gold Top / Serum Separator / Additive Free

Preferred Specimen

Gold Top SST

Reference or Target Ranges

66 – 143 mL/min

Reportable Units

mL/min

Critical Value

Not defined for this assay

Reasons for Rejection



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Hemolysis Threshold
 1000 mg/dL
Icterus Threshold
 70 mg/dL
Lipemia Threshold
 2000 mL
Other
 QNS, contaminated, improperly Labeled, improper specimen type, Serum not collected during 24 hour urine collection, 24 hour urine collection information not included with specimen

Specimen Stability



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Ambient
 2 days
Refrigerated (4°C to 8°C)
 6 days
Frozen(-40°C to 0°C)
 6 months

Performance Information



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Days and Time Performed
 24/7
Expected Turn Around Time
 Stat: 1 hour
Routine: 4 hours
Stat Availability
 Yes
Performing Bench
 UH Chemistry, WCH Chemistry
Methodology/Method Description
 Roche Cobas – Enzymatic

Additional Information/Important Notes

Creatinine clearance is calculated based on plasma and urine creatinine concentrations as well as the timed urine volume (24 hour urine).It is adjusted for patient height and weight. Please note that creatinine clearance is different from eGFR.

CPT Codes

82575