SIRT3 Expression in Granulosa Cells and the Levels of Follicular Fluid Metabolites Among POR Subgroups

Inclusion Criteria: * 1\. Women who are married and aged between 20 to 45 years, diagnosed with infertility; * 2\. Individuals undergoing their first or second cycle of in vitro fertilization (IVF) or intracytoplasmic sperm injection (ICSI), with a scheduled fresh embryo transfer; * 3\. Participants must fulfill the diagnostic criteria corresponding to one of the following prognostic categories as determined by the clinician: Normal prognosis, unexpected poor prognosis, poor prognosis of advanced maternal age, or expected poor prognosis. Exclusion Criteria: * 1\. A body mass index (BMI) of ≥ 35 kg/m²; * 2\. Participation in cycles involving pre-implantation genetic testing or diagnosis of embryos; * 3\. Involvement in cycles utilizing frozen gametes; * 4\. Engagement in cycles that employ donor-derived oocytes; * 5\. Participation in in vitro maturation cycles; * 6.The presence of uterine cavity or endometrial abnormalities, including but not limited to fibroids, endometrial polyps, malformations, adenomyomas, endometritis, endometrial thinning, hydrosalpinx, uterine infections; * 7.The existence of contraindications to assisted reproductive technology or pregnancy, such as uncontrolled liver or kidney dysfunction, diabetes mellitus (with glycated hemoglobin ≤ 7% and fasting blood glucose \< 10 mmol/L), hypertension, thyroid disorders, asymptomatic cardiac conditions, moderate-to-severe anemia, malignancies, a history of thromboembolism or thrombosis, severe mental health disorders, acute infections of the urinary and reproductive systems, sexually transmitted infections, and detrimental lifestyle factors including substance abuse. Additionally, exposure to teratogenic levels of radiation, toxins, or medications (such as prednisone, other hormones, adrenaline, antibiotics, or medications for hypertension, cardiovascular issues, or antiviral treatment) during surgical procedures, as well as any physical conditions rendering pregnancy inadvisable, are also considered disqualifying factors.