By a team of doctors led by Dr Raouf Farag.
Early pregnancy ultrasound scan including dating, viability and location to exclude ectopic pregnancy.
USS Assessment of Early Pregnancy
Our routine practice, when there is a suspicious of a non-viable pregnancy; we rely on the measurements of CRL and gestational sac to make the diagnosis. The current gridlines state that:
a) If the crown rump length (CRL) is > 7mm and there is no embryonic cardiac activity, this is defined as a missed foetal demise.
b) If the mean gestational sac diameter is > 25 mm and there is no yolk sac or embryonic pole, this is defined as an anembryonic pregnancy (blighted ovum)
c) If at the follow up scan after at least one week , there is still no embryonic cardiac activity or gestational sac remains empty, then diagnosis of non-viability can be made
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