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More about Kidney Function Tests:
Definition Purpose Precautions Preparation Aftercare Risks Normal results Abnormal results Resources |
Normal values for many tests are determined by the patient's age and sex. Reference values can also vary by laboratory, but are generally within the ranges that follow.
Urine tests- Creatinine clearance. For a 24-hour urine collection, normal results are 90-139 ml/min for adult males less than 40 years old, and 80-125 ml/min for adult females less than 40 years old. For people over 40, values decrease by 6.5 ml/min for each decade of life.
- Urea clearance. With maximum clearance, normal is 64-99 ml/min.
- Urine osmolality. With restricted fluid intake (concentration testing), osmolality should be greater than 800 mOsm/kg of water. With increased fluid intake (dilution testing), osmolality should be less than 100 mOSm/kg in at least one of the specimens collected.
- Urine protein. A 24-hour urine collection should contain no more than 150 mg of protein.
- blood urea nitrogen (BUN). 8-20 mg/dl
- creatinine. 0.8-1.2 mg/dl for males, and 0.6-0.9 mg/dl for females
— Paula Anne Ford-Martin
