How to prepare for a CCTA

Preparation for a CCTA is set by the imaging center and the ordering clinician, not by a website. What follows is a plain-language map of topics that often appear on prep sheets so you know what to ask. It is not a substitute for the instructions you are given. If those instructions conflict with this page, follow your care team. This is educational, not medical advice.

Before you schedule

Confirm you have a physician order and that the site can accept your insurance or self-pay arrangement. Ask whether the visit is a CCTA (CPT 75574) and not only a calcium score. Tell the scheduler about:

• Kidney disease, dialysis, or a recent creatinine
• Prior reaction to IV contrast or iodine
• Asthma, severe allergies
• Diabetes medicines, especially metformin — do not stop anything unless your clinician says so
• Heart-rate medicines you already take, or a very low or very high resting heart rate
• Possible pregnancy
• Ability to lie flat and hold your breath
• Prior stents, bypass, or a pacemaker (the scan may still be done; the team needs to know)

Heart rate, caffeine, and medicines

Many CCTA protocols work best when the heart is relatively slow and regular. Centers often ask you to avoid caffeine (coffee, tea, soda, energy drinks, some headache medicines) for a period before the scan — commonly several hours to a day. Some ask you to skip a morning dose of a stimulant or to arrive early for a beta blocker. Do not start or stop a heart medicine from this paragraph. Ask the center and your doctor what you should do.

Nitroglycerin (spray or tablet) is often given just before pictures to dilate the arteries. People who take certain erectile-dysfunction or pulmonary-hypertension medicines may not be able to receive nitroglycerin. That is a safety question for the team, not a detail to hide.

Eating, drinking, and the IV

You may be asked to eat lightly or to have nothing by mouth for a few hours. You will have an IV. Wear a shirt that is easy to change; you will likely be in a gown. Leave metal jewelry at home if you can. Contrast can cause a warm flush or a metallic taste; that is commonly described and usually brief. Serious contrast reactions are uncommon but are why the site asks about allergies and watches you afterward.

If you have kidney disease, the team may check labs and talk about hydration. That plan is individual.

The day of the exam

Bring photo ID, insurance card, the order, and a list of medicines. Arrive at the time they give you — cardiac CT is often tightly scheduled around heart-rate prep. You will lie on the table with ECG leads. You will be asked to hold your breath. The scan itself is short. You may wait briefly after contrast.

Ask before you leave:

• Who reads the study, and when will my doctor have the report?
• Do I restart any held caffeine or medicines?
• Any restrictions on driving? (Usually none for CCTA alone; confirm if you were given a sedative, which is uncommon.)

After the scan

CCTA does not treat anything. The value is in the report and the follow-up plan. If you feel unwell after contrast (hives, trouble breathing, chest pain that is new or worse), seek urgent care — do not wait on this website.

What we will not invent

We will not publish a universal NPO time, a caffeine cutoff that every California hospital uses, or a beta-blocker dose. Those belong on the center’s sheet. Phone numbers on our listings are Unknown until a center claims them, so use the number your doctor’s office gives you.

Browse Find a CCTA or city pages such as Palo Alto and Torrance to see where Medicare FFS CCTA was billed in 2024. Then follow that site’s prep. Talk with your doctor.

This article is educational and is not medical advice.