Fasting is not required for a hypertension test. In hypertensive patients, blood pressure varies throughout the day, which means that it is a dynamic process and is not always fixed at a certain value. The value of blood pressure varies at different times of the day. After waking up in the morning, the blood pressure rises gradually. There is usually a peak around 10:00 a.m., and then it starts to decline slowly, with a trough around 2:00 p.m.. Then it gradually rises again, with a 2nd small peak around 5 p.m. The pressure curve of hypertension has a two-high and one-low scoop pattern. So the examination of hypertension needs to be combined with this pattern to make a comprehensive judgment, which time can be measured, only the value is different, need to be specifically analyzed.