Electrophysiological examinations are usually performed inpatient, but in some cases they can be performed on an outpatient basis. Some routine laboratory tests, including an electrocardiogram and blood tests, are performed prior to the electrophysiology examination. (Blood tests may be performed 1 to 2 days prior to the electrophysiology exam.) Your electrophysiologist will take your medical history and perform a detailed physical examination (this may be several days before the electrophysiology exam). The doctor will explain the entire procedure, its purpose, benefits and possible risks. It is best to ask your doctor your questions at this time and, more importantly, to let your doctor know how you feel or are concerned about the test. Nurse Ma Jian of the Cardiovascular Medicine Department at Beijing Fu Wai Hospital will prepare and disinfect the skin at the site where the catheter is inserted into the body. The most common site used is the groin area, but sometimes the arm or neck is also used. Skin preparation and disinfection makes insertion easier and also prevents infection. In addition, the provider will insert a small intravenous needle into a vein in your arm to create an open line so that medication can be given directly into the vein if necessary. If you feel nervous, the doctor will help you relax with a sedative. Precautions before the electrophysiology test Ask about dietary considerations. Usually your doctor will tell you not to eat or drink anything for 6 to 8 hours before the test. However, you may take a few sips of water while taking the necessary medications. Schedule a time for a family member or friend to drive you to the hospital. Be sure to stay in contact with your doctor a few days before the test. You may be asked to stop taking certain medications 2 to 3 days before the test, as it is important to get accurate test results. Bring a list of the names of all medications you are currently taking with you to the hospital, as it is very important that your doctor knows the exact names and dosages of the medications you are taking. Inform your doctor of your history of allergies to any medications. Because the electrophysiology test may last a long time, the doctor will insert a catheter into your urethra to empty your bladder during the test.