About 8 mm.: The thickness of the endometrium normally changes throughout the menstrual cycle. During menstruation, the endometrium is shed. Under the influence of the hormone estradiol, the endometrium then regenerates and usually develops to a normal thickness of 8 or more millimeters (mm). However, many patients with maximal endometrial development of only 4 to 7 mm have successfully achieved pregnancy.
Answered 11/9/2017
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