Normal uterus is 7.5cm length, 5cm wide and 2.5cm thickness.
The endometrial thickness varies depending on menstrual cycle and from individual to individual.
In premenopausal patients,
· during menstruation: 2-4 mm
· early proliferative phase (day 6-14): 5-7 mm
· late proliferative / preovulatory phase: up to 11 mm
· secretory phase: 7-16 mm
· following dilatation and curettage or spontaneous abortion: <5 mm, if it is thicker, to consider retained products of conception