What are the 4 stages of hypertension?

Elevated: Systolic between 120-129 and diastolic less than 80; Stage 1: Systolic between 130-139 or diastolic between 80-89; Stage 2: Systolic at least 140 or diastolic at least 90 mm Hg; Hypertensive crisis: Systolic over 180 and/or diastolic over 120