CAMRT Radiography Practice Exam

Why is it essential to know a patient's creatinine level prior to administering contrast?

1. To assess hydration levels

2. To check kidney function

3. To evaluate blood pressure

4. To determine risk of allergic reaction

The correct answer is: To check kidney function

Knowing a patient's creatinine level prior to administering contrast is essential primarily to check kidney function. Creatinine is a waste product produced by muscles from the breakdown of creatine and is usually cleared from the blood by the kidneys. Elevated creatinine levels can indicate impaired kidney function, which is crucial to assess because contrast media can pose significant risks to patients with compromised renal function. When patients with kidney issues are exposed to contrast, they face a higher risk of developing contrast-induced nephropathy, a potential decline in kidney function. Other factors like hydration levels, blood pressure, and allergic reactions are also important to consider during patient preparation, but they do not directly relate to the primary concern regarding contrast administration—that is, ensuring the kidneys can handle the excretion of the contrast agent safely. Therefore, monitoring kidney function through creatinine levels remains a critical step in preventing potential complications associated with contrast media.