2 doctors weighed in:

How hard is it to diagnose ?Hypoplastic left heart syndrome during?Pregnancy?

2 doctors weighed in
Dr. Nikolaos Zacharias
Obstetrics & Gynecology - Maternal Fetal Medicine
1 doctor agrees

In brief: Tricky.

Hlhs should be blatantly obvious in the third trimester, if one looks.
However, most fetal anatomical surveys are performed at 18-21 weeks, and the full picture of this syndrome may not be esily appreciable at that early point in fetal development. So, in direct answer to your question, hlhs can be missed in over half the cases, unless a late third trimester cardiac evaluation is performed.

In brief: Tricky.

Hlhs should be blatantly obvious in the third trimester, if one looks.
However, most fetal anatomical surveys are performed at 18-21 weeks, and the full picture of this syndrome may not be esily appreciable at that early point in fetal development. So, in direct answer to your question, hlhs can be missed in over half the cases, unless a late third trimester cardiac evaluation is performed.
Dr. Nikolaos Zacharias
Dr. Nikolaos Zacharias
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