Blood Pressure Categories (AHA/ACC 2017)
| Category | Systolic (top) | Diastolic (bottom) |
|---|---|---|
| Normal | < 120 mmHg | and < 80 mmHg |
| Elevated | 120–129 mmHg | and < 80 mmHg |
| High BP Stage 1 | 130–139 mmHg | or 80–89 mmHg |
| High BP Stage 2 | 140+ mmHg | or 90+ mmHg |
| Hypertensive Crisis | > 180 mmHg | and/or > 120 mmHg |
Note: This tool is for informational purposes only. A single reading is not sufficient for diagnosis. Consult your doctor for proper evaluation.
Understanding Your Numbers
Systolic (top number): Pressure in arteries when the heart beats. Diastolic (bottom number): Pressure in arteries when the heart rests between beats. Blood pressure is measured in millimeters of mercury (mmHg).
Tips for Accurate Readings
- Sit quietly for 5 minutes before measuring
- Sit with back supported, feet flat on floor, arm at heart level
- Avoid caffeine, exercise, and smoking for 30 minutes before
- Take 2–3 readings, 1 minute apart; record the average
- Measure at the same time of day (morning is best)
Frequently Asked Questions
What changed with the 2017 AHA/ACC guidelines?
In 2017, the American Heart Association and American College of Cardiology redefined hypertension from ≥140/90 to ≥130/80 mmHg. This lowered Stage 1 hypertension threshold and eliminated the previous "prehypertension" category (replaced with "elevated"). The goal was earlier intervention to prevent cardiovascular events.
What is white coat hypertension?
White coat hypertension is elevated blood pressure measured in a clinical setting (due to anxiety) that is normal when measured at home. It affects up to 15–30% of people diagnosed with hypertension. Home blood pressure monitoring and ambulatory blood pressure monitoring (24-hour wearable monitor) help distinguish it from true hypertension.
What should I do if my reading is in a hypertensive crisis?
If your systolic is above 180 mmHg or diastolic is above 120 mmHg, wait 5 minutes and re-measure. If still elevated and you have symptoms (chest pain, shortness of breath, back pain, numbness, vision changes, headache), call 911 immediately. If no symptoms, contact your doctor urgently. Do not ignore these readings.