CT Head with Intravenous Contrast

What is this test?

A head CT is an X-ray-based imaging test that creates cross-sectional pictures of the brain and skull. Intravenous contrast is a special dye delivered through a vein to improve the visibility of certain tissues and blood vessels.

Why might I need this test?

Your clinician may order this test to evaluate symptoms such as severe headache, weakness, confusion, seizures, head injury, or changes in consciousness. It can help identify bleeding, swelling, tumors, infection, blood-vessel problems, and other abnormalities.

How is the test performed?

You will lie on a table that moves through a CT scanner. X-ray images are taken, and contrast may be given through an intravenous line in your arm. The scan is generally quick and does not hurt, although the injection may cause a brief warm or flushing sensation.

How do I prepare for the test?

Tell the imaging staff about kidney problems, prior reactions to contrast, pregnancy, allergies, and any medicines you take. Follow the facility's instructions, which may include avoiding food or drinks for a short period before the scan. You may be asked to remove metal objects and change into a gown.