A<unk>  is a hand-held ultrasound transducer used to detect the fetal heartbeat for prenatal care. It uses the<unk>  effect to provide an audible simulation of the heart beat. Some models also display the heart rate in beats per minute (BPM). Use of this<unk>  is sometimes known as<unk>  auscultation. The<unk>  is commonly referred to simply as a<unk>  or fetal<unk> . It may be classified as a form of<unk>  ultrasonography (although usually not technically -graphy but rather sound-generating).<unk> s provide information about the fetus similar to that provided by a fetal stethoscope. One advantage of the<unk>  over a (purely acoustic) fetal stethoscope is the electronic audio output, which allows people other than the user to hear the heartbeat. One disadvantage is the greater complexity and cost and the lower reliability of an electronic device. The device was invented in 1958 by Dr. Edward H. Hon, Originally intended for use by health care professionals, this device is becoming popular for personal use.
Doppler fetal monitor
Fetal EEG
Fetal echocardiography
Fetal scalp stimulation test
Nonstress test
Fetal scalp blood testing
Trial of labour
Intrauterine pressure catheter