This scan is used to look at a specific group of cells that produce adrenalin in the body. Prior to the scan the patient is given tablets to block the thyroid gland. These are started 48 hours before the appointment and continued for 4 days. An injection containing a small amount of radioactive material is given in a vein, usually in the arm.
Scanning then takes place, the next day, in the morning and afternoon. The patient lies on a couch while a special type of camera, (a gamma camera) is used to take images of the body.