The endometrium will change cyclically with the changes in a woman’s ovarian cycle, and there are different normal ranges at different stages, around 1-3mm during menstruation, 3-5mm during follicular development, 8-10mm during luteal phase, and 10-12mm during premenstrual phase, with the specifics varying from person to person.
Usually, during menstruation, the endometrial tissue is necrotic and sloughs off due to the drop of progesterone and estrogen in the body and is discharged along with the blood, at which time the endometrial lining is the thinnest and is usually only 1 to 3mm on the 5th day of menstruation.
On the 5th day of the menstrual cycle, from 5 to 14 days, that is, during the follicular development period, the endometrium is affected by estrogen and exhibits proliferative changes, and the endometrium is usually 3 to 5 mm. as the follicle develops and matures and is discharged, the endometrium can reach 8 mm.
After ovulation, in the luteal phase of the ovarian cycle, the corpus luteum secretes progesterone, at which time the endometrium continues to thicken, and can reach 10 mm. before menstruation, the endometrium is usually 10 to 12 mm.
In postmenopausal women, ovarian function is low and hormone levels decline, and the lining of the uterus is usually within 4mm.
It is recommended to evaluate whether the endometrial indicators are normal or not, taking into account the age and different cycles of menstruation. If there is any abnormality, it is recommended to consult a specialist and follow the doctor’s instructions to check and regulate the endometrial lining.