Check which standard blood pressure category a reading falls into.
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This uses the American Heart Association's standard blood pressure categories, based on whichever of your two numbers (systolic or diastolic) lands in the higher category — the readings don't need to both fall in the same range.
Categories run from Normal, through Elevated and two stages of High Blood Pressure, up to Hypertensive Crisis, which the AHA specifically flags as needing immediate medical attention rather than routine follow-up.
A single reading is a snapshot, not a diagnosis — blood pressure naturally fluctuates through the day, and clinical hypertension diagnoses are typically based on multiple readings over time, not one measurement.
A reading of 135/85 mmHg falls into Stage 1 High Blood Pressure, since the systolic number (135) is in that category's range even though the diastolic number alone might read differently.
The AHA specifically recommends seeking immediate medical attention for a reading over 180/120 mmHg, especially if accompanied by symptoms like chest pain, shortness of breath, or vision changes — this isn't a wait-and-see situation.
The AHA's guidelines classify by whichever number is higher precisely because either systolic or diastolic elevation alone carries real cardiovascular risk.
Not on its own — a single elevated reading can reflect stress, recent caffeine, or measurement conditions. Clinical diagnosis typically relies on multiple readings over separate visits or home monitoring over time.
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