Searching online protein creatinine ratio calculator, The usual test, which estimates the protein in urine after 24 hours, is known to be incorrect. Because the excretion of creatinine and protein is rather steady throughout the day, some researchers have suggested measuring the protein creatinine ratio in urine samples collected over a short period of time, or even random (spot) urine samples (provided that the glomerular filtration rate is stable). https://community.tccwpg.com/read-blog/57211