Normal range for thickening of the lining of the uterus?

The normal range for endometrial thickness varies depending on a woman's menstrual cycle phase. In the early follicular phase, it is typically around 1-4 mm, while during the proliferative phase, it can range from 5-11 mm. In the secretory phase, it may reach 7-14 mm. Postmenopausal women usually have a thinner lining, generally less than 5 mm.