What is the primary reason for Sam's burning on urination after an oral cholecystogram?

The primary reason for the burning sensation during urination after an oral cholecystogram is the presence of dye in the urine. During this test, a contrast medium is ingested to visualize the gallbladder and biliary system on X-rays. This contrast material is eventually excreted by the kidneys and enters the urine. The dye can sometimes irritate the bladder and urethra, leading to a burning or discomfort during urination.

Understanding this process emphasizes the link between the administration of the contrast agent and its subsequent effects on urinary function, clarifying the physiological response induced by the foreign substance in the urinary tract. This reaction is considered a common side effect following the use of such imaging techniques.