I am at home blood pressure measurement in hospital and measured blood pressure different how?

At home when I relax spirit special measuring, remain free, while in the hospital when measuring imperceptibly, will have some degree of anxiety, tension, cause high blood pressure. ( this phenomenon is called white coat hypertension ). Medical common sense tells us, a person's blood pressure value every minute in the wave, two measurements in much the same situation is very rare, physicians used traditional mercury measurement, often overlooked two times between smaller fluctuations and each measurement change, but sometimes give people a kind of blood pressure of a variable delusions, and electronic blood pressure regardless of objective, scientific response time measurement. So on the changes of blood pressure, the doctors on the basis, the blood pressure to the hospital, and doctors of the sphygmomanometer measurement comparison. I believe you will understand that not blood pressure gauge itself problem.