Cardiac catheterization is a test that measures the blood pressure within the heart and how much oxygen is in the blood. It is used to diagnose coronary artery blockages in the case of coronary artery disease and heart attacks. It is also used to acquire information about the pumping ability of the heart muscle. Using specifically designed catheters, contrast material is injected and pictures are taken, allowing physicians to see images of the inside of the heart.

Cardiac catheterization is generally performed in conjunction with diagnostic angiography.