When systolic and diastolic blood pressures fall in different categories, the higher category is taken to classify the individual's blood pressure. Classification of blood pressure measurements: Category Systolic BP Diastolic BP Normal <130 <85 High normal 130-139 85-90 Stage 1 hypeension 140-159 90-99 Stage 2 hypeension 160-179 100-109 Stage 3 hypeension >180 >110 Ref: Park 21st edition, page 344.