MSD measures which three dimensions?

MSD measures which three dimensions?

• A. Length, Height, and Width
• B. Length, Width, and Depth
• C. Height, Depth, and Diameter
• D. Length, Diameter, and Thickness

Answer: (A)

Mean sac diameter is based on three orthogonal measurements of the gestational sac to estimate its overall size in early pregnancy. The three dimensions are length (the greatest dimension in the sagittal view), height (the vertical dimension), and width (the transverse dimension). By averaging these three measurements, MSD = (L + H + W) / 3, you get a single value that correlates with gestational age before fetal measurements are possible. The other options mix in terms like depth or diameter or use a single measurement, which aren’t how MSD is defined.

Mean sac diameter is based on three orthogonal measurements of the gestational sac to estimate its overall size in early pregnancy. The three dimensions are length (the greatest dimension in the sagittal view), height (the vertical dimension), and width (the transverse dimension). By averaging these three measurements, MSD = (L + H + W) / 3, you get a single value that correlates with gestational age before fetal measurements are possible. The other options mix in terms like depth or diameter or use a single measurement, which aren’t how MSD is defined.