At present, there is no complete and unified value for the determination of endocrine sex hormones in obstetrics and gynecology in China, and due to the different sources of various reagents, methods of determination, data calculation and units used, even for the same hormone specimen, the results obtained by each laboratory are not exactly the same. The following reference values for sex hormone examination are gathered from various professional books and magazines at home and abroad, and we hope to provide useful references for all colleagues. I. General knowledge of sex hormone check At least one month and preferably three months before the basic sex hormone check, no sex hormone drugs (including progesterone and estrogen) can be used, otherwise the results are not reliable (except for the sex hormone check after treatment). Sex hormones can be checked at any time of menstruation, and the normal value differs for each period. However, the diagnosis and treatment of infertility must be informed about the basal sex hormone level. First, we should choose the 2nd to 5th day of menstruation to check the level called basal sex hormone level, which is best measured on the 3rd day. To be sure that it is the 3rd day of menstruation, it is enough to check sex hormone 5, which can be done without checking progesterone, which should be checked during the luteal phase (21 days of menstruation or 7 days after ovulation); however, if you are not sure whether vaginal bleeding is menstrual, you should check 6 items to prevent misdiagnosis (according to P data, you can probably judge the period of menstrual cycle). In cases of scanty menstruation and amenorrhea, a negative urine pregnancy test, absence of ≥10mm follicles in both ovaries on vaginal ultrasound, and EM thickness of 5mm can also be done as basal status. The basal sex hormone laboratory test should be looked at in this way: the normal value of basal LH and FSH is 5-10 IU/L, and the normal value of basal E2 is 25-50 pg/ml (the results of these 3 items cannot look at the reference values on the laboratory test, they should be according to this standard); PRL and T can be compared with the reference values on the laboratory test of the hospital, and the normal value of P is shown after.