Is a fetal heart rate of 176 beats per minute normal in the NT scan?
Feb 24, 2025
Source: Cainiu Health
Dr. Zhang Lu
Introduction
NT scan is primarily used to assess the risk of fetal chromosomal abnormalities, and fetal heart rate is a key parameter during the examination. A fetal heart rate of 176 beats per minute during an NT scan is considered normal depending on the specific cause. If it is caused by fetal movement or maternal emotional fluctuations, it is generally a normal phenomenon. However, if the elevated heart rate persists and the NT measurement is abnormal, then it is considered abnormal.
Generally speaking, NT refers to an NT scan. Whether a fetal heart rate of 176 beats per minute during an NT scan is normal needs to be analyzed according to the specific circumstances. If there are no other discomforts present, it is generally considered a normal phenomenon. However, if accompanied by other abnormal symptoms, it may not be normal. If any discomfort occurs, timely medical consultation is recommended. Detailed explanations are as follows:
During an NT scan, the fetal heart rate typically ranges between 110 and 160 beats per minute. If the fetal heart rate reaches 176 beats per minute, but other fetal indicators are normal without structural abnormalities, it could be caused by maternal emotional tension, anxiety, fetal movement, or external stimulation during the examination. Usually, after rest, emotional calming, or follow-up testing, the fetal heart rate may return to the normal range. This is generally considered a physiological fluctuation and is relatively common.
However, if the fetal heart rate remains consistently at 176 beats per minute during the NT scan and is accompanied by other abnormalities, such as fetal structural malformations, growth retardation, amniotic fluid abnormalities, or if the mother has conditions like fever, infection, or hyperthyroidism, then a fetal heart rate of 176 beats per minute may be considered abnormal. In such cases, doctors may recommend further tests to ensure the health of the fetus.
A single measurement of fetal heart rate cannot accurately reflect whether the fetus has any abnormalities. Pregnant women are advised to stay relaxed, avoid strenuous exercise, ensure adequate rest, and undergo regular follow-up evaluations of fetal heart rate.
