| Having one's blood pressure measured by a doctor in a hospital or a clinic, and a group health checks tend to stimulate nervousness in the subject and may even create high blood pressure. Also the blood pressure varies in accordance with a variety of conditions and judgement is not possible on the basis of a single measurement.
The blood pressure measured first thing in the morning after getting up, before taking any food and with the subject still, is known a fundamental blood pressure. In practice it is rather difficult to record the fundamental blood pressure, but to come as near as possible to measuring the blood pressure in an environment that is close to this, that is why it is useful to take the measurement at home.
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