Nomograms for Calculation of Urea Clearance

[摘要] Two nomograms are given for use in calculating standard, C [unknown] , or maximum, C m , urea clearance. The first nomogram calculates the urine flow rate, f , from the urine collection time and volume data. With the second nomogram, values of f and urea nitrogen concentrations in blood serum (or plasma) and urine are used to calculate either C [unknown] or C m , according to the value of f . There is no intermediate calculation of √ f . Examples of the use of the two nomograms in the calculation of C [unknown] or C m are given.

[学科分类] 过敏症与临床免疫学