CT Angiography, Lower Extremity Arteries — Peripheral Vascular Blood Flow Evaluation, With Intravenous Contrast

What is this test?

Lower-extremity CT angiography is a specialized X-ray test that shows the arteries supplying the legs and feet. Intravenous contrast makes the blood vessels easier to see and helps assess blood flow.

Why might I need this test?

The test may be ordered to evaluate peripheral artery disease, especially with symptoms such as leg pain while walking, cold feet, rest pain, slow-healing sores, or sudden loss of circulation. It may also be used to plan treatment for a suspected blockage or to assess blood vessels before another procedure.

How is the test performed?

You lie on a CT scanner while a technician injects iodinated contrast through an IV line. The scanner rapidly takes X-ray images as the contrast moves through your arteries. Staying still during the scan helps produce clear images.

How do I prepare for the test?

Follow the imaging center's instructions, and tell the care team about any iodine or contrast allergy, kidney disease, or pregnancy. Fasting is not usually required for this examination alone, but specific instructions may vary. Do not stop prescribed medicines unless your clinician tells you to.