Application of Platelet-rich Plasma (PRP) in Reproductive Medicine

Inclusion Criteria: * Premature ovarian insufficiency: ① Women aged \>18 and \<40 years old; ② Oligomenorrhea or amenorrhea for more than 4 months (excluding pregnancy); ③ Basal follicle stimulating hormone (FSH) \>25IU/L (interval \>4 weeks) at least 2 times, or total antral follicles (AFC) \<5, or anti-Mullerian hormone (AMH) \<1.1ng/mL. * Poor ovarian response: ① Advanced age (≥40 years) or other risk factors for poor ovarian response; ② Poor ovarian response in previous IVF cycle, with ≤3 oocytes retrieved using conventional protocols; ③ Decreased ovarian reserve (antral follicle count \<5\~7 or anti-Müllerian hormone \<0.5\~1.1 ug/L). Meeting any 2 of the above 3 criteria is sufficient. * Intrauterine adhesion: ① Diagnosed by hysteroscopy and scored ≥5 points according to the American Fertility Society criteria (1988); ② With symptoms such as reduced menstrual flow amenorrhea, periodic lower abdominal pain, infertility, or recurrent miscarriage; ③ Adult women with the desire to conceive. * Thin endometium: ①Endometrial thickness \<7mm on ovulation day or on the day of human chorionic gonadotropin (HCG) injection, or \<7mm on progesterone conversion day when using conventional hormone replacement therapy, ②adult women with the desire to comceive. * Repeated implantation failure: Women under 40 years old who have failed to achieve clinical pregnancy after transplanting at least three high-quality embryos within three fresh or frozen cycles. High-quality embryos include: Day 3 embryos (with ≥8 cells, evenly sized blastomeres, and \<10% fragmentation) and blastocysts (≥3BB). Exclusion Criteria: * Alanine aminotransferase \> 3 times the normal upper limit or estimated glomerular filtration rate (EGFR) \< 90 ml/min; * Suffering from hemorrhagic diseases (such as hemophilia) or taking anticoagulant or antiplatelet drugs; * Suffering from serious mental illness, cardiovascular and cerebrovascular diseases and malignant tumors; * Suffering from diabetes with poor blood sugar control or other systemic diseases; * Drug abuse, alcoholism or drug addiction; * Participated in other interventional clinical studies within half a year; * Poor compliance; * Other circumstances that are not suitable for participating in the study.