There are two important tests that accompany the entire IVF process, one is a vaginal ultrasound and the other is the reproductive hormone panel we will talk about today. Some patients may ask, is it really necessary for us to draw so many tubes of blood? The answer is yes. Follow me below to learn exactly how these indicators play a role in IVF. Pre-IVF evaluation: Basal ovarian function can be evaluated by reproductive hormone six on days 2-4 of menstruation before IVF. If FSH<10IU/L, E2<80pg fsh="">10IU/L and E2>80pg/mL, it indicates decreased ovarian function, lower responsiveness to ovulation-promoting drugs, and a correspondingly lower likelihood of IVF success. Reproductive hormone 6 can also help determine the presence of polycystic ovary syndrome, hyperprolactinemia and other gynecological endocrine disorders that affect egg quality and ovulation function. In addition, it is also an important reference for fertility specialists to develop ovulation promotion programs. Ovulation monitoring: 1. Reproductive hormone levels combined with vaginal ultrasound can guide the application of ovulation-promoting drugs. The sensitivity of each individual to exogenous ovulation medications can lead to different levels of follicle development. Regular monitoring of hormone levels can reflect the maturity and quality of follicles and correct the dose of medications. 2. The combination of reproductive hormone levels and vaginal ultrasound can determine the timing of the “night shot” and egg retrieval. The timing of egg retrieval is also an important part of IVF. If the eggs are retrieved early, some follicles may not be mature enough or the number of follicles may be too small, while if the eggs are retrieved late, there is a fear that the well-developed follicles may have already been ovulated, so it is necessary to pay more attention to the level of reproductive hormones in the body when the “night shot” is about to be given. Reproductive hormones can predict the occurrence of ovarian hyperstimulation syndrome (OHSS). When E2> 3500 pg/mL, the risk of OHSS is very high, so you should follow the professional doctor’s guidance and take preventive measures for OHSS. After egg retrieval, it is also necessary to recheck reproductive hormones again to dynamically observe the changes in hormone levels. 4. Reproductive hormone levels combined with vaginal ultrasound determine the need for embryo freezing. In some cases, such as poor endometrium, unsynchronized endometrium and embryo development or high risk of OHSS, it is necessary to forgo fresh cycle embryo transfer and freeze the embryos until the right time to implant the embryos that have bonded in vitro on the endometrium. In case of elevated early P or E2 > 3500 pg/mL during ovulation promotion, it is necessary to freeze the embryos at a later date. Endometrial preparation monitoring: If frozen embryos are transferred, endometrial preparation is required. The endometrial preparation period also requires monitoring of reproductive hormone levels and choosing the right time to transfer frozen embryos in combination with ultrasound monitoring of endometrial thickness, morphology and blood flow. In conclusion, it is understood that reproductive hormones play a very important role in each step of the IVF process. Of course, the most important thing is to follow the professional doctors’ instructions to have the blood drawn on time.