You can check for a heart blockage yourself, but you will need a blood pressure monitor. There are many kinds, so you’ll need to follow the instructions that came with yours. Measure your blood pressure in a quiet room after you’ve been still for 5 minutes. Keep still during the reading and take two or three readings – each about 1-2 minutes apart. Keep a record of your measurements. A regular blood pressure level is less than 120/80 mmHg.