Comparative evaluation of biochemical and microscopic urinalysis.

In the present investigation, only one of 244 (0.4%) urines with abnormal microscopic findings would have been missed because of normal biochemical results of pH, protein, glucose, ketones, bilirubin, urobilinogen, hemoglobin, and leukocyte esterase. These biochemical tests detected 106 of 107 (99.1%) urines with significant microscopic findings. Sixty-three (25.8%) of 244 urines tested could have been eliminated from microscopic examination based on the negative results of the biochemical screen.