To take someone’s blood pressure, put the BP cup snugly on the upper arm and then feel for the brachial artery which will run along the inside of the arm on the little finger side. Put the stethoscope on the brachial artery and pump the cuff. Slowly release the inflated cuff (you will hear sounds of the heart). The first sound you hear is the systolic (contracting) portion of the BP. The second sound you hear is the diastolic (relaxing) portion of the BP. A BP reading is shown as the systolic over diastolic pressure. For example: 120/80.