This test may be done in the health care provider's office or in a hospital. You will be asked to lie in with the upper part of your body slightly raised.
Three blood pressure cuffs are wrapped snugly around your arm and leg. The health care provider inflates the cuffs, and a machine called a plethysmograph measures the pulses from each cuff. The test records the maximum pressure produced when the heart contracts (systolic blood pressure).
Differences between the pulses are noted. If there is a decrease in the pulse between the arm and leg, it may indicate a blockage.
When the test is complete, the blood pressure cuffs are removed.