Normal fetal heart rate range
May 22, 2022
Source: Cainiu Health
Dr. Lv Aiming
Introduction
Typically, the normal fetal heart rate (FHR) range is 125–160 beats per minute (bpm); however, the currently accepted normal range is 110–160 bpm. An FHR >160 bpm is considered tachycardia, while an FHR <120 bpm is considered bradycardia. FHR values >160 bpm or <110 bpm may indicate possible fetal distress. Fetal heart rate monitoring is routinely performed during prenatal visits.
It is generally believed that when the fetal heart rate (FHR) falls within the normal range, the short-term risk to the fetus is relatively low. However, if the baseline FHR is abnormally high or low, fetal distress should be suspected. So, what constitutes the normal fetal heart rate range?
Normal Fetal Heart Rate Range
Traditionally, the normal FHR range was considered to be 125–160 beats per minute (bpm); however, current clinical guidelines define it as 110–160 bpm. An FHR >160 bpm is considered tachycardic, while an FHR <120 bpm is considered bradycardic. Clinically, FHR values >160 bpm or <110 bpm raise concern for possible fetal distress. During routine outpatient prenatal visits, healthcare providers routinely auscultate the fetal heart rate and perform electronic fetal monitoring (EFM). A normal FHR is typically between 120–160 bpm, with appropriate baseline variability.
If fetal tachycardia is detected, it must be taken seriously. Pregnant women are advised to promptly visit a hospital for fetal heart rate monitoring. Once diagnosed, timely intervention is essential. Pregnant women should maintain a left lateral decubitus position, remain calm and relaxed, avoid excessive stress, ensure adequate rest, and refrain from overexertion. Under normal circumstances, the fetal heart rate ranges between 110–160 bpm. If the FHR exceeds 161 bpm—and especially if it surpasses 180 bpm—this indicates significant fetal tachycardia. Potential underlying causes include intrauterine hypoxia, maternal hypoxemia, fetal cardiovascular dysfunction, placental insufficiency, or placental infection.
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