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MSD -- Mean Sac Diameter. The size of the gestational sac ("bag of waters"). Usually measured during the first trimester.
Nagele's Rule -- A method of estimating the due date.
Neural Tube Defect -- see NTD, below ...
A common method is to measure the mean sac diameter (MSD), add 30 to the sac size in millimeters, to give gestational age in days.
 See also: Abdomen, Early pregnancy, Diagnosis, Uterine, Intrauterine
  
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