There is little chance of misdiagnosis when the fetal heart is gone. Generally the loss of fetal heart is recognized as the death of the fetus, and the doctor will be very careful to come to this conclusion, so the chances of misdiagnosis are not high. Fetal heart can be detected by manual auscultation (by stethoscope, Doppler fetal heart rate monitor or fetal heart rate monitor) and fetal ultrasound. 1. Manual auscultation (auscultation of the fetal heart by stethoscope, Doppler fetal heart rate monitor, or fetal heart rate monitor) is a method in which the doctor searches for a position in the abdomen of the pregnant woman that is close to the heart of the fetus and uses an instrument to auscultate the sounds of the fetal heart. This method is easily affected by the thickness of the fat layer of the abdominal wall of the pregnant woman, the position of the fetus, fetal movement, and other factors, and there is a possibility that the sound of the fetal heart may not be heard temporarily. However, this method is generally not a diagnostic basis for the disappearance of fetal heartbeat. 2. Fetal ultrasonography: Fetal ultrasonography is used by ultrasonographers to determine the presence of fetal heartbeat by imaging the fetal heart directly on the instrument’s display screen through the ultrasound probe. If there is no apparent fetal heartbeat visible to the naked eye, the doctor will usually continue to observe the fetus for a period of time to determine whether the fetal heartbeat has disappeared. Therefore, the absence of fetal heartbeat as determined by ultrasound is usually not a misdiagnosis.