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A simple method for measuring 24-hour urinary excretions of salt and potassium in field surveys was investigated. Six adults (four women and two men) engaged in the collection of 24-hour urine for seven days using a portable semiautomatic urine sampling cup (Urinemate P). A filter paper strip was soaked in the urine inside the upper compartment of the cup for every excretion and a free volume of urine was collected. NaCl/creatinine, K/creatinine, NaCl, K and creatinine (Cr) of 24-hour urine were calculated from the urine volume and Na, K and Cr concentrations in the urine inside the lower compartment of the cup. Urinary NaCl/Cr and K/Cr were calculated by a simple method from the concentrations of Na, K and Cr in the solution extracted from a day's filter paper strips. By multiplying the above ratios of NaCl/Cr and K/Cr by 24-hour Cr excretion predicted from the equations of Kawasaki et al., 24-hour urinary excretions of NaCl and K were obtained by our simple method.The correlation coefficients between the simple method and the 24-hour control of NaCl were from 0.872 (p<0.05) to 0.951 (p<0.001) for six subjects. These results show that this simple method is useful for the determination of NaCl in field surveys over a long period of time. While the correlation coefficients for K were significant for four subjects (from 0.760, p<0.05 to 0.898, p<0.01), they were not significant for two female subjects (0.654 and 0.557). It was shown that further improvement was necessary for the determination of K.

A simple method for measuring 24-hour urinary excretions of salt and potassium.