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Posted by / 19-Mar-2019 18:17

Gestational dating sonogram

If this is observed, the probability of a continued pregnancy is better than 95 percent.

Missed abortions and blighted ovum will usually give typical pictures of a deformed gestational sac and absence of fetal poles or heart beat.

For example, if another scan done 6 or 8 weeks later says that one should have a new due date which is further away, one should not normally change the date but should rather interpret the finding as that the baby is not growing at the expected rate.

Ultrasound can also very importantly confirm the site of the pregnancy is within the cavity of the uterus. A visible heartbeat could be seen and detectable by pulsed doppler ultrasound by about 6 weeks and is usually clearly depictable by 7 weeks.Different babies of the same weight can have different head size, therefore dating in the later part of pregnancy is generally considered unreliable.(Chart and further comments) Dating using the BPD should be done as early as is feasible.Fetal heart rate tends to vary with gestational age in the very early parts of pregnancy.Normal heart rate at 6 weeks is around 90-110 beats per minute (bpm) and at 9 weeks is 140-170 bpm.

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