Final answer:
The best test to evaluate a patient's glomerular filtration rate (GFR) is the urine creatinine clearance test, which uses the concentration of creatinine in both blood and urine.option c is true
Step-by-step explanation:
The most accurate laboratory test to evaluate a patient's glomerular filtration rate (GFR) is urine creatinine clearance. This test measures the volume of blood cleansed of creatinine, a waste product from muscle metabolism, and gives a clear picture of kidney function. The creatinine clearance test involves measuring both the concentration of creatinine in the blood and in a timed urine sample. The formula used to calculate creatinine clearance is:
Ccr = (U x V) / B
where U is the concentration of creatinine in urine, V is the urine flow rate, and B is the concentration of creatinine in blood. To standardize across different body sizes, creatinine clearance is corrected for body surface area (BSA) and expressed in ml/min/1.73 m².