Before undergoing PCI, which test helps assess the risk of contrast dye?

• A. Assessing kidney function to evaluate risk of contrast dye.
• B. Measuring blood cholesterol.
• C. Evaluating lung capacity.
• D. Testing thyroid function.

Answer: (A)

Assessing kidney function before PCI is essential because the risk of contrast-induced nephropathy depends on how well the kidneys filter the contrast dye. Measuring serum creatinine and estimating GFR provides direct risk stratification: patients with reduced kidney function are more likely to suffer kidney injury from the dye, so clinicians can implement preventive steps such as adequate hydration, using the lowest effective contrast dose, or selecting safer contrast agents. Other tests like cholesterol, lung capacity, or thyroid function don’t directly predict this dye-related risk.