A nurse reviews a client’s lab values and sees the BUN is 18 mg/dL and the creatinine is 0.7 mg/dL. If the physician asks the nurse for the BUN-to-creatinine ratio (rounded to the nearest whole number), the nurse would answer

Number 3 is correct.

The BUN-to-creatinine ratio is used as a tool in determining kidney function: The ratio indicates if the levels are proportionate to each other. It is calculated by dividing BUN by creatinine. 18/0.7 = 25.7:1, which rounds to 26:1