- Variation limits within normal ranges on their screening visit are: Blood pressure (BP) (seating) between 90 and 130 millimeters of mercury (mm Hg) for Systolic pressure and between 60 and 90 mmHg diastolic pressure, heart rate (HR) between 55 and 100 beats per minute (bpm) and respiratory rate (RR) between 14 and 20 per minute.