Was in for a scan at CD10. Leading follicle size was 2.19cm x 1.64cm. What does that mean? Mostly i've been told the size in millimeters for exampel 14mm. Why now two numbers? Doctor told me just that i have a great leading follicle on the right side sized 2.19cm x 1.64cm. Had my lh-surge on CD12. Now im DPO 3.