A nurse is caring for a client who will have blood sampling for a serum creatinine level and asks what this test shows. Which of the following responses should the nurse make?

A. "We'll find out if any medications, such as steroids, are interfering with your kidney function": While certain medications can affect kidney function, serum creatinine is not a specific test for drug interference. It is primarily used to measure renal clearance and function rather than identifying medication effects. B. "This test will tell your doctor how your kidneys are functioning": Serum creatinine is a key indicator of kidney function because it reflects the kidneys’ ability to filter metabolic waste from the blood. Elevated levels suggest impaired renal function. C. "This test will tell if you have severe renal impairment or a disease": Serum creatinine can indicate renal impairment, but it does not exclusively diagnose severe disease. Mild to moderate kidney dysfunction can also elevate creatinine levels. D. "You'll have to ask your doctor": Deferring the client’s question without providing health teaching misses an important opportunity for patient education. Nurses are expected to explain the purpose of common diagnostic tests within their scope of practice.