How does iohexol work as a contrast agent?

Iohexol, the active ingredient in the brand Omnipaque, contains iodine which is opaque to X-rays. Therefore, structures that contain the iohexol are opaque and appear white on a radiographic image. For example, if your doctor injects iohexol into the veins in your leg, those veins will show up as white on the X-ray. This could allow your doctor to check for problems, such as blood clots or collapsed veins. Or the iohexol might be injected into your spinal cord prior to an X-ray in a procedure called myelography, which is used to check for tumors or injuries to the spinal cord. When swallowed, the oral version of iohexol reveals what may be causing problems in the esophagus, stomach or intestines.

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