What diagnostic test is often used to confirm glycosuria?

The correct choice is urinalysis because it is the standard diagnostic test to detect the presence of glucose in the urine, which confirms glycosuria. Glycosuria occurs when the level of glucose in the blood exceeds the renal threshold, leading to its excretion in the urine. A urinalysis will include a dipstick test that can specifically indicate the presence of glucose. Additionally, further analysis of the urine sample can quantify the amount of glucose present.

Blood tests, while useful for measuring blood glucose levels and diagnosing conditions such as diabetes, do not directly assess urine composition and therefore cannot confirm glycosuria. CT scans and X-rays are imaging techniques that provide visual assessments of body structures but have no utility in diagnosing the presence of glucose in urine. Thus, urinalysis stands out as the most appropriate and direct method to confirm glycosuria.