What should I do before taking a blood pressure measurement to ensure accurate results?

Avoid bathing, drinking alcohol or caffeine, smoking, exercising, and eating for at least 30 minutes before taking a measurement, and rest for at least 5 minutes beforehand. Sit in a comfortable chair with your back and arm supported, feet flat, legs uncrossed, and the arm cuff at heart level resting on a table. Remain still and do not talk during the measurement, and ensure no electrical device is within 12 inches (30 cm) of the monitor. (Page 21-22, 25)