Whether endometrial 4mm is normal depends on which stage of the menstrual cycle the endometrial thickness is checked, and also in conjunction with the actual age of the judgment, for example, just after menstruation, perimenopause endometrial 4mm normal.
The thickness of the endometrium changes with the ovarian cycle, after the end of menstruation the endometrium is completely shed, the thickness of the endometrium is the smallest in the whole menstrual cycle, most of the women are between 5mm to 8mm, usually the menstrual flow is relatively small, the appearance of 4mm endometrium is also normal.
Some women aged 45 to 55 years old, enter the perimenopause after the decline in hormone levels in the body, there will be a decrease in menstrual flow, uterine atrophy performance, at this time, the endometrium is thin, in the 4mm or so is normal.
For women in their childbearing years who normally have normal menstrual flow, an endometrium of 4mm is on the thin side. Before the onset of menstruation, the endometrium is the thickest, between 10 and 15mm, and 4mm before the onset of menstruation is not normal.