Fetal heart monitoring on an empty stomach may affect the accuracy of the test results if hypoglycemia occurs. Fetal heart rate monitoring is a means of monitoring and evaluating the condition of the fetus in the uterus, which can initially determine whether the fetal heartbeat is normal or not, and whether there is any distress in the uterus, and the accuracy of the results of the examination is closely related to the physical condition of the pregnant woman at the time of the examination. The accuracy of the test results is closely related to the physical condition of the pregnant woman at the time of the test. If the pregnant woman suffers from hypoglycemia, such as panic attacks and shortness of breath during fasting, it will affect the fetal movement and heart rate, and the accuracy of the test results may be affected by doing the fetal heart rate monitoring at this time. Pregnant women should eat a moderate amount of food before the fetal heart monitoring test to avoid hypoglycemia; during the test, they should adopt a semi-recumbent position and keep their body in a comfortable and relaxed state, which will help the accuracy of the test results. If pregnant women need to do fetal heart monitoring, it is recommended to go to a regular hospital, under the guidance of the doctor for standardized operation.