Accuracy and precision of urinary pH determinations using two commercially available dipsticks.

The accuracy and precision of urinary pH determinations using commercially available dipsticks were studied. Two products were evaluated by 17 MT(ASCP) technologists over the pH range 4.5 to 9.0. The study included accuracy, reproducibility, variation among technologists, and variation between products. The results demonstrated considerable variation among technologists, products, and true pH levels in dipstick urinary pH determinations, and that very good or very poor results could be obtained, depending on the true pH level being sampled and on the choice of technologist.