Timed urine collections, accuracy

Twenty-four hour urine collection is preferred for best accuracy, although point-in-time samples can be used. Urine samples are collected from the species in question by appropriate methods (see section Assessment of Renal Injury by Urinalysis ). Total protein and creatinine are determined by appropriate methods (see under Assessment of Renal Injury by Serum Chemistry and Assessment of Renal Injury by Urinalysis ) and a urine proteimcreatinine ratio is calculated. 

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