Simply measure the Width from one edge of the placenta to the other (yellow line). Measure Thickness by making a perpendicular line to the Width from one surface of the placenta to the other (orange line). Use Thickness value for both the Height and the Thickness data when entering into EPV calculator.
Please use this text for page 11, Flat Placentas:
Simply measure the Width from one edge of the placenta to the other (yellow line). Measure Thickness by making a perpendicular line to the Width from one surface of the placenta to the other (orange line). Use Thickness value for both the Height and the Thickness data when entering into EPV calculator.