For most infertile women, they may not have a clear idea about the basal endocrine examination for women, so the following is a brief introduction to the basal endocrine examination for women. However, it is important to note that the basal endocrine examination for infertile women must be performed on the second or third day of the menstrual cycle, which means that the first day is counted from the time of redness. The following hormones are often measured in infertile women: 1. follicle stimulating hormone (FSH) is a glycoprotein hormone secreted by the basophilic cells of the anterior pituitary gland. The concentration of FSH is 1.5-10 U/L in the preovulatory period, 8-20 U/L in the ovulatory period, and 2-10 U/L in the late ovulatory period. low FSH values are seen during estrogen and progesterone treatment, and in Silhan syndrome. high FSH values are seen in premature ovarian failure, ovarian insensitivity syndrome, primary amenorrhea, etc. Luteinizing hormone (LH) is also a glycogenic hormone secreted by basophilic cells in the anterior pituitary gland. Its main function is to promote ovulation and the formation of luteinizing hormone. Blood LH concentration is 2-15 U/L in the preovulatory period, 20-100 U/L in the ovulatory period and 4-10 U/L in the late ovulatory period. 5 U/L or less is a reliable indication of hypogonadotropic hypogonadism, which is seen in Silhan syndrome. LH/FSH >= 3 is one of the bases for the diagnosis of polycystic ovary syndrome. 3. Prolactin (PRL) is secreted by lactotropic cells, one of the eosinophils in the anterior pituitary gland, and is a simple protein hormone whose main function is to promote the production and discharge of milk from the proliferating mammary glands. During the non-lactation period, the normal value of blood PRL is 0.08-0.92 nmol/L. Higher than 1.0 nmol/L is considered as hypergammaglobulinemia. 4. Estradiol (E2) is secreted by the follicles of the ovaries. The main function is to make the endometrial glands grow into a proliferative phase and promote the development of female secondary sexual characteristics. The concentration of blood E2 is 48-52lpmol/L during ovulation, 370-1835pmol/L during ovulation, and 272-793pmol/L during late ovulation. low values are seen in ovarian hypofunction, premature ovarian failure, and Silhan syndrome. 5. Progesterone (P) is secreted by the corpus luteum of the ovary. The main function is to promote the endometrium to change from the proliferative phase to the secretory phase. The blood P concentration is 0-4.8mnol/L in the preovulatory phase and 7.6-97.6nmol/L in the late ovulatory phase. low blood P value in the late ovulatory phase is seen in luteal insufficiency and ovulatory uterine dysfunctional bleeding. 6.Testosterone (T) In women, 50% of testosterone is converted from peripheral androstenedione, 25% is secreted by the adrenal cortex, and only 25% comes from the ovaries. The main function is to promote the development of the clitoris, labia and mons pubis, and has an antagonistic effect on androgens, and has a certain influence on the systemic metabolism. The plasma testosterone level in women is 0.7-2.1 nmol/L, generally not higher than half of the normal value, and high T value, called hypertestosteronemia, can cause female infertility.