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Information for Patients: Commonly Used Diagnostic Tests : CT
Medical Description What is it? CT (computed tomography), sometimes called a CAT scan, uses special x-ray equipment to take many images from different angles and depths. The images are joined together to show a cross-section of body tissues and organs. CT scanning gives more detailed information than regular x-rays. Contrast (dye) may be given before the test through an IV (intravenous), by mouth, or rarely by rectum, to help make the images clearer. What will it show? C T scans can be made of any part of the body. In patients with hypertension they are most often used to look at the adrenal glands and kidneys. How is it done? The CT scanner is a large, square machine with a hole in the center, like a doughnut. You will lie still on a table that can move up or down, and slide into and out from the center of the hole. Though the technician will be able to see and speak to you, you will be alone in the room during the scan. It is important to lie very still during the scan. You may be told to hold your breath or take deep breaths during the scan. You may hear a humming or swooshing sound during your scan. Are there any risks? No. Practical Details Where do I go to have the test? The Herbert Irving Pavilion – Ground Floor located at 161 West 168 th Street How Do I Prepare for the Test? No special preparation is needed for a CT scan unless you are to receive contrast. If you are to receive contrast, do not eat or drink anything for four hours before your CT scan. You may be given contrast by mouth, IV or (rarely) by enema. If given IV, a small catheter connected to an intravenous line is placed in an arm or hand vein. The contrast is quickly injected through the IV. If you are to have IV contrast, you will be asked if you have any allergies or have ever had a serious reaction to IV contrast, medicines, bee stings, latex or food. If you are to have CT scan with oral contrast, you will drink about 1 quart of contrast before the scan. You will be told to drink the contrast over 1 hour or more, depending on the body part to be scanned. Some people may be concerned about the amount of radiation they received during a CT scan. It is true that the radiation exposure from the CT scan can be higher than from a regular x-ray. However, not having the procedure can be more risky than having it, especially if cancer is suspected. People considering CT must weigh the risks and benefits. Before CT scan, your doctor may order a blood test to make sure you are not pregnant. Women must tell the doctor or x-ray technician if there is any chance that they are pregnant, or if they are breast-feeding. If you are diabetic:
Take along your insurance card(s) and x-ray request form to the test if you are an out-patient. When you arrive, you will complete a questionnaire. You will change into a hospital gown. If you are going to have a head or neck scan you must remove your earrings, wigs, hairpins, clips, and dentures before the scan. How long will it take? The test itself takes about 10 minutes, depending on the body part to be scanned. How much will it cost? With contrast $561.00 Without contrast $524.00 How much will I have to pay? If you have Medicare or Medicaid the cost is usually covered in full. If you have other forms of insurance you will need to check with your insurance if the cost is covered.
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