Thallium Exercise Test. This is an exercise stress test that will be combined with the injection of Thallium, a low dose radioactive material. This test is done to evaluate your heart’s response, rate and rhythm, and to evaluate the blood supply to the heart muscle during exertion and at rest. This test will take about an hour and you will be asked to return to be re-scanned about 3 hours later. The return trip will take about forty minutes.

The Preparation

Ask your doctor about taking your medications. Some medicines must not be taken before this test.

Do not eat a full meal, although you may eat a light meal 1-2 hours before the test. Do not eat or drink anything containing caffeine for 4 hours before the test.

Come to the hospital about 15 minutes before your test is scheduled. You will be asked to sign a consent form when you come to the hospital.

During the test

An intravenous (IV) is started when you arrive.

You will have your blood pressure checked, and an electrocardiogram (EKG) done before the test. You will remain hooked up to both instruments during the procedure.

Exercise will be done on a treadmill or stationary bike. If you experience any discomfort or dizziness, please let the doctor know.

Just before the exercise is finished, the Thallium will be injected. You will lie on a stretcher and be “scanned” by a camera immediately after exercise. This process will take about 45 minutes.

The IV will then be removed from your arm, and you will be given an appointment to return in about 3 hours. At that time, you will report directly to the department and will be scanned once again.

Your doctor will have the results of this test by the next day. If you have any other questions or concerns, please ask your doctor.

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