As the cuff is deflated, the Doppler sensor on the foot detects the moment when blood flow starts up again by making a noise that sounds like your heartbeat. Checking the air pressure of the deflating cuff at this time shows the leg blood pressure. After all the cuffs on one side have been tested, the other leg will be checked in the same way. For comparison, you will also have a blood pressure checked in each arm using the Doppler technique. The whole test usually requires close to 45 minutes.
Some patients have their leg pressures checked both before and after exercise.
If this is the case for your test, you will be asked to walk on a treadmill for a short time and then will have the test repeated afterward. The exercise version of this test requires more time to complete.