The CAP Urine Chemistry Survey Program for 1977.

Eleven analytes were presented in the Urine Chemistry Survey Program during the year 1977. These included amylase, calcium, phosphorus, sodium, potassium, creatinine, osmolality, 17-ketosteroids, total protein, glucose, and urea nitrogen. More than 450 laboratories participated. Deficiencies in assay performance were found for amylase, 17-ketosteroids, and total protein. Sharp shifts in precision performance were seen in urea nitrogen analysis. Severe biases are apparent in glucose analysis using neocuproine and ferricyanide methods.