'Apparent protein' in human urine: some surface film measurements

Abstract

The surface-tension method of Gunton and Burton (1947) has been simplified and modified for use with undiluted urine. Possible increases in the exptl. error are offset by increased accuracy in the final step, where an indicator oil of a higher surface tension is used to measure the area at constant pressure of a solid surface film. This method has been used to determine the "apparent protein" content of urine from healthy and tuberculous subjects, the latter group giving higher values. The fluctuation in the apparent pro-teinuria at various times of the day has been followed in 6 cases, and some regularity has been noted.