Which of the following statements about creatinine clearance test is true:
Creatinine clearance test is the most accurate / gold standard test for assessing GFR Creatinine clearance may overestimate the actual GFR as renal function declines Creatinine clearance may underestimate the actual GFR as renal function declines Creatinine clearance is more accurate than Inulin clearance in estimating GFR