Question

what does a creatinine clearance test measure?

Explanation:

A creatinine clearance test measures the kidneys' ability to filter creatinine from the blood. Creatinine is a waste product produced by muscle - metabolism. The test helps assess kidney function by estimating the glomerular filtration rate (GFR).

Answer:

The kidneys' ability to filter creatinine from the blood to assess kidney function (estimating glomerular filtration rate).