In recent years, wearable devices such as smart bracelets and smartwatches have gradually become popular, and some products are also equipped with daily health monitoring functions such as heart rate, blood oxygen saturation, and sleep monitoring. As a result, many people have developed the habit of frequently checking health monitoring data. Some users have expressed anxiety due to poor monitoring data, and even self diagnosed with sleep disorders and other diseases based solely on device data. Can the 'diagnosis' of these smart wearable devices be trusted? Wu Hang, chief physician of Xuanwu Hospital of Capital Medical University, reminds that such products are mainly used for self-monitoring of daily health trends and cannot be used as a basis for disease diagnosis and treatment, nor can they replace corresponding medical examinations and tests. Taking sleep monitoring wristbands as an example, these devices usually infer sleep stages based on data such as physical activity, blood oxygen, heart rate, etc. Although they can roughly reflect deep sleep, light sleep, and nighttime wakefulness, their data cannot reach the level of professional medical equipment in terms of accuracy and dimensions due to factors such as wearing methods, sensor accuracy, and environmental interference, "said Wu Hang. How to correctly understand the role of smart wearable devices in daily monitoring and health management? Wu Hang emphasized that one should not self diagnose as a "sleep disorder" or other illness based on poor device values. He reminded us to pay attention to the following points: firstly, there are physiological fluctuations in human health indicators, such as daily fluctuations in blood pressure and blood sugar, which are not fixed and unchanging values. If a certain indicator is not ideal, there is no need to be overly anxious; Secondly, currently most smart wearable devices have not reached the precision of medical devices and can only serve as auxiliary references for their own health status to a certain extent; Thirdly, when there are frequent and significant changes in health indicators, it may indicate potential diseases, and it is recommended to seek medical attention promptly at a medical institution. In addition to smart wearable devices, various medical devices such as electronic blood pressure monitors, oximeters, and ventilators are gradually entering ordinary households. What should be paid attention to when using such professional equipment at home? Wu Hang stated that such devices should be operated in a standardized manner during use. For example, home ventilators used to assist in the treatment of sleep apnea need to be evaluated by doctors based on sleep monitoring and lung function tests before deciding whether to use them. If it is indeed necessary to use, specific parameters should be set under the guidance of a doctor and adjusted regularly according to subsequent progress and changes. Experts remind that the use of medical devices at home is influenced by various factors such as personal operating methods, environment, and individual status, and there may be deviations in accuracy. Do not adjust medication or treatment plans based on self testing results, and it should be judged by doctors based on professional examination results. Specifically, when using an electronic blood pressure monitor, a standard sized cuff is generally suitable for individuals with an upper arm circumference of 22cm to 32cm. If it exceeds this range, a larger or smaller cuff should be selected; When using a pulse oximeter to measure blood oxygen saturation, nail polish and nail polish may affect the measurement accuracy, and it is also necessary to avoid using the pulse oximeter and the sphygmomanometer on the same side of the limb; When using a blood glucose meter, it is important to keep the test strips away from light and moisture. After opening, the test strips should be used within 3 months to prevent inaccurate results due to enzyme inactivation. (New Society)