![]() Related pathologyĪ slow fetal heart rate is termed fetal bradycardia and is usually defined as 1: This is followed by a decrease in FHR becoming on average:Īlthough in the healthy fetus the heart rate is usually regular, a beat-to-beat variation of approximately 5 to 15 beats per minute can be allowed. The FHR is then usually around 100 to 120 beats per minute (bpm).įHR then increases progressively over the subsequent 2-3 weeks becoming 7: Evolution through gestationĪlthough the myocardium begins to contract rhythmically by 3 weeks after conception (from spontaneously depolarizing myocardial pacemaker cells in the embryonic heart) it is first visible on sonography around 6 weeks of gestation. It is measurable sonographically from around 6 weeks and the normal range varies during gestation, increasing to around 170 bpm at 10 weeks and decreasing from then to around 130 bpm at term. Pregnancy ultrasound evaluation.A normal fetal heart rate (FHR) usually ranges from 120 to 160 beats per minute (bpm) in the in utero period. Pregnant over 35: Here's what your 20-week ultrasound can show you.Why to avoid ‘keepsake’ 3-D and 4-D ultrasounds. Avoid fetal "keepsake" images, heartbeat monitors.You can learn more about how we ensure our content is accurate and current by reading our editorial policy. We link primary sources - including studies, scientific references, and statistics - within each article and also list them in the resources section at the bottom of our articles. Medical News Today has strict sourcing guidelines and draws only from peer-reviewed studies, academic research institutions, and medical journals and associations. At 20 weeks, a healthy heart rate is around 140 beats per minute. Fetal heart rate: It is usually possible to hear the fetus’s heart during this ultrasound, which can provide valuable information. ![]() The findings can also help inform the plan for the delivery.
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