Add as many past readings as you are able. This will give the clinician a better idea of your blood pressure overtime. If the reading is dangerously high, you should repeat it immediately and if it remains above 180/110 urgently contact NHS Direct on 111, or the surgery. If the reading is dangerously low, you should repeat it immediately and if it remains below 80/50 urgently contact NHS Direct on 111, or the surgery.