The test measures blood flow through the heart during rest or stress. Determining if the heart vessels are blocked and if they are then how much and especially, to size the extent of the damage caused by a heart attack. The procedure is considered a non-invasive imaging method and has no side effects or complications, as the exposure to radiation is minimalistic. The examination is of two parts, rest and stress, which can be conducted in the same day or several days apart, usually the stress part is done first. During stress exam you will exercise on a treadmill until the desired heart rate is reached or given a drug (depending on availability) that will increase the blood flow to your heart, this is called pharmacological stress test. Fasting: This test requires fasting as follows: Solid food: 6 hours earlier to the test Smoking: 6 hours earlier to the test Caffeine containing beverages: 24 hours earlier to the test Medication contradiction: A list of medications should be provided as they may interfere with the examination. The following medications should be stopped: Medications containing Theophylline Heart medications and antihypertensive drugs should be stopped 48 hours earlier to the examination Tracer method of intake: The radio pharmaceutical tracer will be injected intravenously. Examination duration: The imaging process will take 15-30 minutes; the imaging will be conducted 20 minutes after the tracer is injected. The two types can be conducted either on the same day or several days apart, however if they are done the same day, they should be 3 hours apart.