Pre-operative precautions for egg retrieval: 1. Both couples need to sign the informed consent form related to egg retrieval. 2, 2 days before the egg extraction surgery night strictly according to the doctor’s prescription medication, 2 days before the surgery, the doctor will prescribe ovulation-inducing injections, such as HMG, Dabiga, Dafylline, etc., after picking up the medication, you must hand over all the medications to the nurse to check the name of the medication, the dosage, the time and method of injection, and confirm that there is no error before leaving the hospital. Injections will be given on time that night. It is not necessary to come to the hospital the day before the operation. 3.Pay the surgery fee before the surgery, the nurse will prescribe the fee according to the medical advice and surgery needs, you must pay the fee before the surgery and confirm with the nurse. All bank cards with the word “UnionPay” can be used in our hospital. 4.Come to the hospital on time before the operation, both husband and wife arrive at 7:30 a.m. on the day of the operation to the undergraduate, after the time if the ovulation is already at their own risk. The husband should masturbate on the day of egg collection to collect semen. 3-7 days before the egg collection, the husband should be asked to have a semen ovulation (coitus is allowed), the semen collection should be done with the sterile semen cup provided by the Department of Sperm Retention, and urination should be done before the egg collection and semen collection. 5.If there is any difficulty in semen collection, one copy of semen can be frozen and preserved in advance. 6.Actively prevent and control respiratory and intestinal infections. 7, 3 days before the operation, avoid eating all kinds of easy to flatulence things, such as milk, soy products, preoperative diet light and easy to digest, to seven minutes full is appropriate, a small amount of water, not fasting, so as to avoid hypotension. 8, avoid make-up and spray perfume. 9, the process of egg extraction is not very painful, do not have to worry about, such as poor ovarian position, follicles, fear of pain and other factors, you can consider intravenous anesthesia, need to make an appointment in advance. Anesthesia before the night after 8 p.m. need to fast food and water. 10, a few days before the operation to ensure adequate sleep, keep in a happy mood.