Which laboratory value was reported pre-procedure for the 80-year-old patient in the catheterization case?

• A. Serum creatinine 1.1 mg/dl
• B. Hematocrit 38.5%
• C. White blood cell count 8.5 th/ul
• D. Platelet count 276 th/ul

Answer: (A)

The main idea is evaluating kidney function before a catheterization that uses iodinated contrast because the contrast can injure the kidneys. Serum creatinine is a direct, widely used measure of renal function, and reporting it pre-procedure helps assess risk and guide precautions. A value of 1.1 mg/dL provides a baseline for this patient, and in an elderly person, even small changes can signal reduced function when estimating the GFR. The other values—hematocrit, white blood cell count, and platelet count—are important for general health and procedural safety but do not specifically assess risk for contrast-induced kidney injury or drive the pre-procedure planning in this context. Therefore, the pre-procedure laboratory value reported is serum creatinine.