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Diagnosing High Blood Pressure

High blood pressure can only be diagnosed after taking several readings to find your average blood pressure. To determine your average blood pressure, your blood pressure needs to be taken two or more times, and each reading must be from a different day. If the average of these readings is more than 140/90, you have high blood pressure.
A single reading that is more than 140/90 doesn't necessarily mean that you have high blood pressure; however, your healthcare provider will probably want to monitor your blood pressure over time to see if it stays there. You can also have high blood pressure if the average of only one of the numbers (systolic or diastolic) is too high.

Effects of High Blood Pressure

The body structures that chronic (long-term) high blood pressure affects most include the:
  • Blood vessels
  • Heart
  • Brain
  • Kidneys
  • Eyes.
Because of the effects of high blood pressure on these vital organs, a person who has had it for a long time (known as chronic hypertension) can have:
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Last reviewed by: Arthur Schoenstadt, MD
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