| Consensus-based Recommendation 3.E3 | |
|---|---|
| Expert consensus | Level of consensus +++ |
| References: 32 , 33 , 34 , 35 , 36 | |
| Fetal gestational age (based on maternal medical history) must be verified through measurement of the crown-rump length in early pregnancy and corrected if the discrepancy is 7 days or more. | |
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