An ankle-brachial index (ABI) test is a straightforward method that your medical professional can use to evaluate the circulation of blood in your legs. This examination is used by medical professionals to screen for peripheral artery disease (PAD). When you have this condition, it means that the arteries in your arms and legs are blocked off, which can be very painful. This causes your blood flow to slow down, which prevents your limbs from receiving the adequate amount of oxygen they require. If you have PAD, you have an increased risk of suffering from a heart attack or stroke. During the ABI test, your blood pressure at your ankle and blood pressure at your arm are compared to one another. If you have a low score on this test, it is likely that the blood circulation in your legs is not very good.