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Creatinine, 24 hour (or timed) urine

Item Value
Approval req'd? Yes, if testing is requested between midnight and 8:00 AM.
Available Stat? Yes
Test code CRU
Test group Creatinine
Performed by Parnassus Chemistry
In House Availability Test available 7 days per week from 8:00 AM to midnight only.
Method Spectrophotometric, kinetic (alkaline picrate,Jaffe) assay on Beckman DXC 600/800 analyzers. Calibration traceable to isotope dilution mass spec (IDMS) standardization

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Collection Instructions Include the patient's weight in kg on the request slip.
Container type 24 hour urine collection container

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Amount to Collect Entire urine output during collection period
Sample type Timed urine collection
Preferred volume 1 mL urine
Min. Volume 0.2 mL urine
Units mg/kg/D
Normal range Age (years):
< 1 8-20 mg/kg/D
1-11 8-22 mg/kg/D
12-15 8-30 mg/kg/D
Male 16-89 years 14-26 mg/kg/D
Female 16-89 years 11-20 mg/kg/D
> 90 years > 9 mg/kg/D
Stability Refrigerated 2 days
Turn around times STAT 1 hour, Routine 4 hours
Additional information To convert mg/kg/d to µmol/kg/d (SI units) multiply by 8.84. Output varies with the diet and weight.
Last Updated 3/24/2013 7:40:06 PM
Entry Number 266
Lab Procedure Link Click here for Procedure
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