Iron generally has no effect on sphygmomanometers, and attention should be paid to blood pressure measurement with standardized operation. If the sphygmomanometer for the old-fashioned sphygmomanometer, the main components of its internal glass tubes and mercury, measuring blood pressure mainly through the pipeline, so that the pressure of the cuff is transmitted to the glass tube containing mercury, resulting in numerical values, its measurement process and components, iron will not have an impact on it. If for the electronic blood pressure monitor, its internal mainly electronic components, through the electronic receptors to feel the pressure within the cuff, general electronic blood pressure monitor internal no magnetic objects, so iron will not have an impact on the blood pressure monitor. Measurement of blood pressure should pay attention to the way and method, it is recommended that the blood pressure measurement at rest, the cuff should not be too long, too tight, measuring cuff flush with the heart, such as the discovery of elevated, should be taken on three occasions on the same day non-measurement of the method of rechecking, and there are still abnormalities, it should be timely consultation and treatment.