Medicine Which of the following is the most accurate method to assess decline in GFR during initial stages of Renal insufficiency A Serum creatinine B Creatinine Clearance C Serum BUN D Serum Urea 💡 Explanation Which of the following is the most accurate method to assess decline in GFR during initial stages of Renal insufficiency ✓ Correct Answer: B. Creatinine Clearance