How many injections are needed for test tube

In vitro fertilization is a surgery that many female friends who are unable to successfully conceive will undergo, but the process is still quite painful. Female friends will not feel it so clearly, and it may even affect their subsequent menstrual cycles, making their menstruation irregular. Therefore, after completing the in vitro fertilization, they must work hard to regulate their bodies, and they also need to get injections regularly.

Controlled superovulation:

Since the length of the natural menstrual cycle varies from person to person, and there are also differences between different cycles of the same patient, it is not easy to arrange the time for egg retrieval. In addition, only one dominant follicle develops in the natural cycle, and only one embryo can be formed after fertilization. The pregnancy rate of transplanting one embryo is very low. Therefore, controlled superovulation is needed to enhance and improve ovarian function, so as to obtain multiple healthy eggs without being restricted by the natural cycle and provide multiple embryo transplants.

And try to synchronize corpus luteum development with endometrial function. Controlled superovulation usually involves using GnRHa to downregulate FSH and LH in the body, and then administering HMG or FSH ovulation drugs to stimulate the growth of follicles in the ovaries. The drug dosage is adjusted based on the patient's responsiveness to the drug. The number of eggs obtained will vary depending on the patient's age and drug dosage.

Monitoring follicles:

In order to evaluate the effect of ovarian stimulation and determine the time for egg retrieval, vaginal B-ultrasound is required to monitor the size of follicles, and blood tests are conducted to check the E2 value (estrogen) and adjust the dosage of medication. When two to three or more follicles are larger than 1.8 cm in diameter, and the number of follicles larger than 1.4 cm is equivalent to the E2 value, human chorionic gonadotropin (hCG) can be injected to promote the maturation of the follicles. Egg retrieval is done 34-36 hours after hCG injection.

Egg Retrieval:

The most commonly used method of egg retrieval is to insert the egg retrieval needle through the vaginal vault and directly reach the ovary to absorb the eggs under local anesthesia and then immediately transfer the eggs to a culture dish containing embryo culture medium under a microscope and culture them in an incubator at 37 °C.

Sperm collection:

Sperm retrieval is done on the same day as egg retrieval. Wash your hands before collecting semen and use masturbation to collect semen. The small cup given is sterile. Do not touch the rim or inside of the cup when taking the liquid. The semen was extracted and processed by swim-up method or Percoll density gradient centrifugation.

In vitro fertilization:

4 to 5 hours after egg retrieval, place the processed sperm and eggs in the same culture dish. After culturing them together for 18 hours, the fertilization can be observed under a microscope. If the sperm quality is too poor to allow natural fertilization, forced fertilization must be achieved by microinjection (see intracytoplasmic sperm insemination).

Embryo transfer:

The fertilized egg can develop into an 8- to 16-cell embryo after 48-72 hours of in vitro culture. At this time, the number of embryos to be transplanted is determined based on the patient's age, whether she has been pregnant before, and the quality of the embryos. Excess embryos can be frozen and stored. Embryo transfer generally does not require anesthesia. Currently, embryos are usually transplanted 2 to 3 days after fertilization. I use embryo transplantation 3 to 5 days after fertilization. The later the embryo transfer is delayed, the higher the requirements for in vitro culture conditions will be. However, delaying the transfer is more in line with the physiology of pregnancy. At the same time, it can also eliminate inferior embryos through natural selection, thereby increasing the pregnancy rate and reducing the multiple birth rate.