The tilt table test looks for the cause of fainting (syncope) and lightheadedness. In this test, you will lie on a table that’s tilted at different angles while various machines record your heart’s electrical activity, your blood pressure, and your oxygen levels. Some people feel nothing at all during the test, while others feel lightheaded or completely pass out. If this happens, the table will be moved to a horizontal position and you’ll be closely monitored. Most people complete this test in 1 to 2 hours, but it can take longer depending on how your body responds. You can return home the same day of the test.