According to the American Heart Association (AHA), normal SBP is less than 120 mmHg. Elevated SBP is between 120-129 mmHg, while hypertension stage 1 is 130-139 mmHg, and hypertension stage 2 is 140 mmHg or higher. Hypertensive crisis is when SBP is above 180 mmHg, requiring immediate medical attention.
