Estrogen 140pmol/L 12 days after ovulation may be caused by diseases such as women entering menopause and polycystic ovary syndrome. Estrogen in the female body will change with the menstrual cycle changes, in the female body before ovulation estrogen normal value between 48 ~ 521 pmol / L, ovulation 70 ~ 1835 pmol / L, ovulation after the end of 272 ~ 793 pmol / L, 12 days after ovulation estrogen 140 pmol / L is relatively low, it may be a woman into menopause, polycystic ovary syndrome and other diseases. syndrome, and other diseases. When a woman reaches the age of 45 to 55, ovarian function will gradually decline, and the estrogen secreted by the ovaries during menopause will further decrease, and the estrogen 12 days after ovulation may be 140 pmol/L. Patients with polycystic ovary syndrome (PCOS) will have hyperandrogenemia, which leads to endocrine disorders in the patient, resulting in a decrease in estrogen secretion, and the estrogen 12 days after ovulation may be 140 pmol/L. However, patients with PCOS may also have no ovulation. There are more reasons for the decrease of estrogen after ovulation, and those with abnormalities can go to the hospital for examination and treatment.