[Correlation between four-hour creatinine clearance and 51Cr-EDTA test].

Background: Creatinine clearance as a measure of glomerular filtration rate has several sources of error such as tubular creatinine secretion or faulty urine collections. On the other hand 51Cr-EDTA test is reliable and accurate, except in patients with edema, in whom the radioisotope equilibrium is retarded after injection.

Aim: To validate a 4-hours creatinine clearance correlating it with 51Cr-EDTA test.