Augmented Renal Clearance in the Adult Non-critically Ill Surgery Patient: a Prospective Point Prevalance Study

An 8-hour urine collection was carried out to determine the CrCl8h. Participants were asked to empty the bladder at the start of the collection. From then, patients were asked to collect urine in a recipient during the following 8 hours. If an indwelling transurethral or suprapubic urinary catheter was in situ, the collection bag was emptied at the start of the collection. After 8 hours, total urinary volumes (Uv8h) were measured with a measuring cup and urinary creatinine concentrations were determined by laboratory analysis. Midterm serum creatinine samples were obtained at 4 hours after the start of the urinary collection. Based on these values, CrCl8h was calculated according to the standard formulas and normalized to a body surface area (BSA) of 1.73m².