MSD is measured until which gestational week?

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Multiple Choice

MSD is measured until which gestational week?

Explanation:
Mean sac diameter is used to estimate gestational age in the very early pregnancy when the embryo is not yet large enough for crown-rump length measurement. It is calculated by measuring the gestational sac in three perpendicular dimensions and averaging them: MSD = (D1 + D2 + D3) / 3. This method is most reliable up to about the twelfth week of gestation. After around 12 weeks, measuring the crown-rump length provides a more accurate dating, so MSD dating is no longer used as the primary method.

Mean sac diameter is used to estimate gestational age in the very early pregnancy when the embryo is not yet large enough for crown-rump length measurement. It is calculated by measuring the gestational sac in three perpendicular dimensions and averaging them: MSD = (D1 + D2 + D3) / 3. This method is most reliable up to about the twelfth week of gestation. After around 12 weeks, measuring the crown-rump length provides a more accurate dating, so MSD dating is no longer used as the primary method.

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