A blood pressure level of 135/100 mmHg may be hypertensive. 1. If 135/100mmHg is the average of three measurements taken in the office on non-same day, a diastolic (low pressure) level of 100mmHg is greater than the diagnostic criterion of a diastolic (low pressure) level of 90mmHg, which is likely to be hypertension. However, care should be taken to exclude the influence of the patient’s agitation, nervousness, anxiety and other factors. 2. If the blood pressure level is measured at home, it is also likely to be hypertension, but we should exclude the errors caused by the number of measurements, measurement methods and other factors. 3. If this blood pressure is the result of an ambulatory blood pressure test, it is more likely to be hypertension. This is because the diagnostic criteria for ambulatory blood pressure hypertension meet any of the following levels: 24-hour average blood pressure ≥ 130/80 mmHg, daytime average blood pressure ≥ 135/85 mmHg, and nighttime average blood pressure ≥ 120/70 mmHg. In conclusion, a blood pressure level of 135/100mmHg has a high likelihood of hypertension, and patients are advised to go to the hospital promptly for early and regular treatment.