The current measured blood pressure diastolic blood pressure of 90mmHg has in principle reached the diagnostic standard of hypertension. The current diagnostic standard of hypertension in China is that hypertension can be diagnosed when the systolic blood pressure is greater than or equal to 140mmHg or (and) the diastolic blood pressure is greater than or equal to 90mmHg measured at the clinic in a quiet state without the use of antihypertensive drugs. However, a single blood pressure measurement at 138/90 mmHg is not fully diagnostic of hypertension. Generally, blood pressure measurements are not diagnostic of hypertension until the average of three measurements on the same day meets the diagnostic criteria for hypertension. When measuring blood pressure, it is important to be in a quiet state, rest in a sitting position for 5-10 minutes, calm and avoid emotional tension. At present, the blood pressure measured at the clinic prevails. If the blood pressure measured at home reaches 135/85 mmHg or more, you should go to the hospital promptly to clarify whether you have hypertension.