Alternatively, the protein / creatinine ratio in a random urine specimen usually reliably estimates grams of protein/1.73 m 2 body surface area (BSA) in a 24-hour collection (eg, values of 40 mg / dL protein and 10 mg / dL [884 micromol / L] creatinine in a random urine sample are equivalent to the finding of 4 g/1.73 m 2 in a 24-hour specimen).