Page 20 - SONO 260 THE FIRST TRIMESTER
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                                                                                      ž By adding 30 to the MSD (measurement in mm), sonographers can obtain an estimate for the gestational age in days.
ž When the gestational sac seems visually disproportional to the size of the embryo, that is, too small or too large compared to the size of the embryo, an MSD measurement can be exceedingly beneficial in determining if asymmetry truly exists.
ž An irregularly shaped gestational sac can be a sign of
impending pregnancy failure.
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