Current Classification Stages of Hypertension
Blood pressure is classified into four distinct categories: normal (<120/<80 mm Hg), elevated (120-129/<80 mm Hg), stage 1 hypertension (130-139/80-89 mm Hg), and stage 2 hypertension (≥140/≥90 mm Hg). 1, 2
Blood Pressure Classification Framework
The 2025 AHA/ACC guideline establishes the following staging system based on average readings from at least 2 careful measurements obtained on at least 2 separate occasions:
Normal Blood Pressure
- Systolic: <120 mm Hg AND
- Diastolic: <80 mm Hg
Elevated Blood Pressure
- Systolic: 120-129 mm Hg AND
- Diastolic: <80 mm Hg
Stage 1 Hypertension
- Systolic: 130-139 mm Hg OR
- Diastolic: 80-89 mm Hg
Stage 2 Hypertension
- Systolic: ≥140 mm Hg OR
- Diastolic: ≥90 mm Hg
Critical Classification Rules
When systolic and diastolic readings fall into different categories, always classify the patient according to the higher blood pressure category. 2 For example, a patient with 128/82 mm Hg would be classified as stage 1 hypertension (not elevated), because the diastolic reading places them in stage 1.
Clinical Significance of Each Stage
The classification system is pragmatic and based on cardiovascular disease risk stratification and treatment benefit demonstrated in clinical trials 2:
Stage 1 hypertension is independently associated with subclinical coronary atherosclerosis 3 and carries a 35% higher 10-year cardiovascular disease risk and 36% higher lifetime risk compared to normal blood pressure 4
Progression from stage 1 to stage 2 results in a dramatic 156% increase in 10-year cardiovascular disease risk and 129% increase in lifetime risk 4
The elevated blood pressure category identifies individuals who require intensive lifestyle modification to prevent progression to hypertension
Important Caveats
This classification system applies to non-pregnant adults and is most valuable for untreated individuals when making prevention and treatment decisions 2. The framework excludes pregnant patients who require separate blood pressure thresholds and management approaches.
Avoid relying on single blood pressure measurements for classification—the staging requires averaging multiple readings across different occasions to ensure accuracy and avoid misclassification 1, 2.