The ideal normalization parameter for urea and creatinine clearance is not yet known. The best current practices are to normalize urea clearance by anthropometric V, corrected for certain conditions such as edema, and creatinine clearance by BSA. Normalization parameters should be calculated using the actual weight. In addition, the ideal weight also should be used in underweight individuals.
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Antonios H. Tzamaloukas (1996) studied this question.
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