My doctor calls this doctor’s office hypertension. If the reading is high, he always makes a point to circle around and do it again at the end of the appointme

My doctor calls this doctor’s office hypertension. If the reading is high, he always makes a point to circle around and do it again at the end of the appointment. For me, there’s usually a 10-20 (units, I forget which ones) difference. I do not have hypertension