By correcting protein for creatinine concentration, this test provides a reasonable estimate of daily protein excretion from a random urine sample. The ratio in g/g approximately equals daily protein loss in grams. It has largely replaced 24-hour collection for many clinical purposes due to its convenience.
This test is used to evaluate proteinuria, screen for kidney disease, assess preeclampsia in pregnancy, and monitor patients with known kidney conditions. Sample type is a random urine specimen.