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Hello, severe pulmonary stenosis is often life threatening during pregnancy, but as she is asymptomatic, then it is unlikely that her diagnosis may be correct. However pertaining to your query, echo at 21 weeks is safe for the foetus, however the ideal time is 18-20 weeks as as per indian laws if a decision to abort is to be considered based on congenital anomaly then termination has to redone before 20weeks of gestation. Regards.
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