The difference between blood pressure measured lying down and sitting down is usually small, but if there is a difference, it is important to consider whether there is a difference in the method of measurement, the environment and the standard.
Under normal circumstances, there is little difference between blood pressure in the lying and sitting positions. When measured in the sitting position, blood pools in the veins of the lower extremities, resulting in less return blood volume and lower blood pressure.
Therefore, if there is a difference, it is generally lower than that in the sitting position, and the error is generally not more than 15 mmHg. If there is a significant difference between the two blood pressures, it may be due to inconsistencies in the measurement method, the environment, and the standard.
Measurement of blood pressure to ensure that the patient is in a quiet state, thirty minutes before the measurement to avoid strenuous exercise, drinking hot tea, etc., so that the sphygmomanometer, cuff and the patient’s heart to maintain the three at the same level, the cuff should be appropriate to ensure that the measurement method, the environment, the standard is consistent.