How is a tilt table test performed?
The patient rests on a tilt table in a supine position for 20 minutes. Then the table is tilted to 70 degrees within 10 to 20 seconds.
The blood pressure is measured at 1 and 5 minutes, although different labs employ different protocols. In normal individuals, there is a transient reduction in systolic, mean, and diastolic blood pressure following tilt, followed by recovery in 1 minute.
Orthostatic hypotension is defined as a drop in systolic blood pressure of ≥20 mm Hg or diastolic blood pressure of ≥10 mm Hg within 3 minutes of tilt-up with only a modest increase in the heart rate.