Personal Attribute Blood Pressure C0005823 Blood Pressure Blood_Pressure blood pressure C54706 The pressure of the circulating blood against the walls of the blood vessels. Blood Pressure Blood Pressure The force of circulating blood on the walls of the arteries. Blood pressure is taken using two measurements: systolic (measured when the heart beats, when blood pressure is at its highest) and diastolic (measured between heart beats, when blood pressure is at its lowest). Blood pressure is written with the systolic blood pressure first, followed by the diastolic blood pressure (for example 120/80). NICHD BP Clinical Attribute