Cardiac Catheterization: What It Is and What to Expect
Medically reviewed by Achuta Uppu, MD, Internal Medicine. Last reviewed: October 23, 2026.
What kind of doctor provides Cardiac Catheterization?
A cardiologist, a doctor who specializes in the heart, performs cardiac catheterization. The test is done by cardiologists and a trained health care team. A direct primary care or concierge doctor can be a first stop for an evaluation and can refer you to a specialist when needed.
What it is
Cardiac catheterization passes a thin, flexible tube, called a catheter, into the heart. The catheter is most often put in through the groin or the arm.
Why a doctor might recommend it
A doctor may use it to find the cause of, or check on, these problems.
- Heart failure
- Coronary artery disease, which affects the arteries of the heart
- Heart defects that are present at birth
- Problems with the heart valves
It may also be done to treat some heart conditions, or to find out if you need heart surgery. If a heart artery is blocked, you may have angioplasty and a stent placed during the procedure.
How to prepare
Common preparation steps include these.
- Do not eat or drink for 6 to 8 hours before the test.
- Tell your doctor if you are allergic to seafood or any medicines, or have had a bad reaction to contrast dye or iodine.
- Tell your doctor about any medicines you take, including Viagra or other medicines for erectile dysfunction. Say if you might be pregnant.
What happens during it
An intravenous line, or IV, is placed in a vein in your arm. Through the IV you get medicine to help you relax. You also get numbing medicine where the doctor will insert the catheter. The doctor places a small tube called a sheath in the blood vessel, and then puts the catheter in through it. The doctor watches live x-ray images to guide the catheter to the heart.
The doctor may inject dye to look at blood flow in the heart. The test may last 30 to 60 minutes, and longer if you need special procedures.
Recovery
When the procedure is over, the doctor removes the catheters, sheath, and guidewire. A dressing and pressure are put on the site to stop bleeding. You are then moved to a recovery room, where your heartbeat and blood pressure are watched. If the catheter went in at the groin, you will often lie flat for a few to several hours to avoid bleeding. You may need to stay the night in the hospital, depending on your health and any added procedures.
A small bruise and some tenderness at the access site is normal. Keep your follow-up appointments or tests and take medicines as directed. Call your healthcare provider right away for dizziness or fever. Also call for an irregular, very slow, or fast heartbeat. Also call if the site has more pain, redness, bruising, or swelling, or yellow or green fluid. Call if the arm or leg used becomes numb, weak, cold, or blue. Call 911 or go to the emergency room if bleeding at the site will not stop with firm pressure, or if you have chest pain or discomfort lasting two minutes or more, trouble breathing, fainting, or sudden weakness or trouble speaking. Call 911 right away if you or someone else has signs of a heart attack or a stroke.
Risks and side effects
It carries a slightly higher risk than other heart tests. It is very safe when done by an experienced team. Possible risks include a heart attack, a stroke, an irregular heartbeat, low blood pressure, and a reaction to the contrast dye. Other risks are bleeding, infection, and pain at the insertion site, damage to blood vessels, and blood clots. Rare risks include a collapsed lung and emergency surgery to repair a torn blood vessel. The contrast dye can also damage the kidneys, which is more common in people with diabetes or kidney problems.
Who performs it
A cardiologist performs the procedure with a trained health care team.
Common questions
How long does cardiac catheterization take?
Cardiac catheterization may take 30 to 60 minutes. It may take longer if you need special procedures.
Does cardiac catheterization hurt?
You may feel some discomfort or pressure where the catheter is placed. You may also feel discomfort from lying still during the test or lying flat on your back afterward.
How does a direct primary care or concierge doctor fit in?
A direct primary care doctor charges a flat monthly fee instead of billing insurance, while a concierge doctor usually charges more and often works alongside insurance. Before the test, tell your doctor about your allergies and the medicines you take. After the procedure, keep any follow-up appointments or tests.
Sources
- MedlinePlus - Cardiac catheterization
- National Heart, Lung, and Blood Institute - During Cardiac Catheterization
- National Heart, Lung, and Blood Institute - Recovering from a Cardiac Catheterization
Medical Disclaimer
This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.
