II. Indications
- Creatinine Clearance Calculation
- Measure completeness of 24 hour Urine Collection
III. Normal 24 Hour Creatinine Excretion
- Male
- Age 20 to 50: 18.5 to 25.0 mg/kg/day
- Age 50 to 70: 15.7 to 20.2 mg/kg/day
- Range: 0.8-1.8 grams per 24 hours
- Female
- Age 20 to 50: 16.5 to 22.4 mg/kg/day
- Age 50 to 70: 11.8 to 16.1 mg/kg/day
- Range: 0.6-1.6 grams per 24 hours
IV. Low Urine Creatinine
- Values above decrease with advancing age
- Low value suggests inadequately collected specimen
