Studies with a new colorimetric test for proteinuria.

URING THE PAST HALF CENTURY a large number of tests for the detection of protein in the urine have been described. Three of these tests have gained outstanding popularity and are widely used in clinical practice. These are the sulfosalicylic acid test, the nitric acid ring test, and the heat and acetic acid test. Because of the wide usage of these tests as a part of “routine urinalysis” there is a tendency to disregard their shortcomings, but critical consideration of the problem suggests possibilities for improvement. The present report describes a new type of test for the detection of protein in the urine and presents data on the behavior of the test.