What does my blood pressure reading mean?

Normal: <120/80. Elevated: 120-129/<80. Stage 1 hypertension: 130-139/80-89. Stage 2: ≥140/≥90. The top number (systolic) measures pressure during heartbeat; bottom (diastolic) between beats. Every 20/10 mmHg increase above 115/75 doubles cardiovascular risk.