Acetrizoic acid is primarily used as a contrast medium in medical imaging, particularly in X-ray examinations. It helps enhance the visibility of internal structures, such as blood vessels, the urinary tract, and other soft tissues, by providing a clear contrast against surrounding tissues. This makes it easier for healthcare professionals to diagnose abnormalities, blockages, or structural issues. It is often administered intravenously or through other routes depending on the area being examined. Due to its iodine content, it effectively absorbs X-rays, improving the clarity and detail of the images. Its application is crucial in procedures like angiography, urography, and other diagnostic imaging techniques.