Calculate Mean Sac Diameter (MSD) to assess early pregnancy development and estimate gestational age. MSD is measured from the inner edge to inner edge of the gestational sac in three perpendicular planes.
Measure the gestational sac in three perpendicular planes:
Length
Longest diameter
Width
Perpendicular to length
Height
Third perpendicular dimension
Formula: MSD = (Length + Width + Height) ÷ 3
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