The standard normal range for low blood pressure, also known as diastolic blood pressure, is 60-80 mm Hg. If the most widely used diagnostic criteria for elevated diastolic blood pressure are followed, diastolic blood pressure is considered elevated if it is greater than or equal to 90 mm Hg. If the latest hypertension guidelines are followed, diastolic blood pressure is considered elevated if it is greater than or equal to 80 mmHg. If a patient’s diastolic blood pressure is found to be abnormal when the blood pressure is measured, the patient should not be considered to be hypertensive based on just one abnormal blood pressure, but at least three measurements on different days, or the patient should be advised to have a direct ambulatory blood pressure monitoring to assess the patient’s overall blood pressure for 24 hours to help further clarify whether the patient has abnormal blood pressure.