IVF (Tüp Bebek)

What is IVF?

IVF (In Vitro Fertilization – Tüp Bebek) is an assisted reproductive technique in which the sperm and egg are combined in a laboratory setting to achieve fertilization, and the resulting embryo is then transferred into the uterus.

Indications for IVF

IVF is one of the most common and effective treatments for infertility. It can be applied in cases involving both female and male factors, as well as unexplained infertility. Key indications include:

1. Female Factors:
   • Problems related to the fallopian tubes, such as blockage or damage.
   • Ovulatory disorders (e.g., Polycystic Ovary Syndrome, anovulation).
   • Endometriosis affecting the reproductive organs.
   • Diminished ovarian reserve due to age or premature ovarian failure.
   • Uterine abnormalities that may interfere with implantation.
2. Male Factors:
   • Low sperm count (oligospermia), reduced motility (asthenospermia), or abnormal morphology (teratospermia).
   • Obstructive and non-obstructive azoospermia (absence of sperm).
   • Sexual dysfunctions affecting ejaculation.
3. Couple-Related:
   • Unexplained infertility despite normal evaluations.
   • Difficulty achieving intercourse.
4. Reducing Genetic Risks:
   • Utilization of preimplantation genetic testing (PGT) when needed.
5. Other Special Situations:
   • Pre-cancer treatment egg or embryo freezing.
   • Repeated IVF failures.
   • Use of donor eggs or sperm when necessary.
   • Surrogacy cases where the uterine environment is unsuitable.

IVF Process Steps

The IVF process is a carefully planned procedure consisting of several stages designed to maximize the chance of pregnancy:

1. Preparation and Pre-Evaluation
   • Detailed medical history and evaluation to determine infertility causes.
   • Tests and imaging (ultrasound, hormone levels, etc.) to assess the woman’s ovarian reserve and uterine condition; semen analysis for the man.
2. Ovarian Stimulation (Ovulation Induction)
   • Administration of gonadotropins (FSH, LH) to stimulate multiple follicle development.
   • Monitoring of follicular growth via ultrasound and blood tests, followed by an ovulation trigger (hCG or GnRH agonist) when appropriate.
3. Egg Retrieval (Oocyte Aspiration)
   • Eggs are collected approximately 34-36 hours after the trigger injection under anesthesia using a transvaginal ultrasound-guided needle.
   • Collected eggs are evaluated in the laboratory, and the best quality ones are selected.
4. Sperm Collection and Preparation
   • A semen sample is collected via masturbation and processed in the laboratory to select the most motile and viable sperm.
5. Fertilization in the Laboratory
   • Conventional IVF: Sperm and eggs are co-incubated for natural fertilization.
   • ICSI (Intracytoplasmic Sperm Injection): A single sperm is injected directly into each egg.
   • Fertilization is monitored and embryos are cultured.
6. Embryo Development and Selection
   • Embryos are typically cultured until day 3 or day 5; the highest quality embryo is selected for transfer.
   • Preimplantation genetic testing (PGT) may be performed if indicated.
7. Embryo Transfer
   • An embryo is transferred into the uterus using a thin catheter in a procedure that typically lasts 10-15 minutes.
   • Post-transfer, the patient is advised to rest briefly, though prolonged bed rest is not necessary.
8. Luteal Phase Support
   • Progesterone supplementation is given to support the endometrium and help embryo implantation.
9. Pregnancy Test
   • A blood pregnancy test is performed 10-14 days after embryo transfer to determine treatment success.

Factors Affecting IVF Success

The success rate of IVF depends on various factors affecting both partners:

1. Woman’s Age:
   • Younger women (under 35) generally have higher success rates, while rates decline significantly after 40.
   • Oocyte quality and quantity decrease with age.
2. Egg and Sperm Quality:
   • High-quality eggs and sperm are crucial for successful fertilization and embryo development.
3. Embryo Quality:
   • The developmental potential and selection of the best embryo(s) influence implantation success.
   • PGT can help in selecting genetically healthy embryos.
4. Overall Health of the Woman:
   • A healthy BMI and balanced hormone levels improve treatment outcomes.
5. Previous IVF History:
   • Past successful or unsuccessful cycles can affect expectations and outcomes.
6. Uterine Health:
   • Structural abnormalities, polyps, or fibroids can hinder implantation.
7. Treatment Protocols and Clinical Expertise:
   • The use of advanced technologies (e.g., ICSI, PGT, embryo freezing) and the experience of the clinic can directly impact success rates.
8. Psychological Factors:
   • Stress and emotional well-being can influence the outcome; psychological support is beneficial.
9. External Factors:
   • Smoking, alcohol use, and environmental exposures can adversely affect reproductive health.

Techniques Used in IVF

Various techniques are employed during IVF to enhance success rates, monitor embryo development, and prevent genetic disorders. These include:

1. Intracytoplasmic Sperm Injection (ICSI)
   • Description: A single sperm is injected directly into the cytoplasm of each egg.
   • How It Works: This method is used when there is low sperm count or motility, or previous fertilization failures.
   • Indications: Cases of male infertility, poor sperm quality, or previous IVF cycle failures.
2. Preimplantation Genetic Testing (PGT)
   • Description: Genetic tests performed on a few cells biopsied from the embryo before transfer.
   • How It Works: Helps select genetically healthy embryos to transfer and reduce the risk of inherited disorders.
   • Indications: Couples at risk for genetic disorders or with recurrent IVF failures.
3. Embryo Freezing (Cryopreservation)
   • Description: High-quality embryos are frozen for future use.
   • How It Works: Embryos are vitrified and stored, then thawed when needed for subsequent transfers.
   • Indications: To preserve extra embryos, improve overall cycle success, or for patients undergoing cancer treatment.
4. Embryo Transfer (ET)
   • Description: The process of placing a selected embryo into the uterus.
   • How It Works: A thin catheter is used to gently deposit the embryo into the uterine cavity.
   • Indications: The final step in the IVF process once a viable embryo is identified.
5. TESE/TESA for Limited Sperm Cases
   • Description: Techniques for sperm retrieval when sperm is absent or limited in the ejaculate.
   • How It Works: TESE (Testicular Sperm Extraction) or TESA (Testicular Sperm Aspiration) are performed to obtain sperm directly from testicular tissue.
   • Indications: Obstructive azoospermia, non-obstructive azoospermia, or prior failed sperm retrieval attempts.
6. Oocyte Freezing
   • Description: Freezing eggs for future use.
   • How It Works: Mature eggs are vitrified and stored, then thawed for fertilization when needed.
   • Indications: Women with diminished ovarian reserve, those planning to delay childbearing, or pre-cancer treatment preservation.
7. Oocyte Aspiration (Egg Retrieval)
   • Description: The collection of eggs after ovarian stimulation.
   • How It Works: Under ultrasound guidance, eggs are retrieved transvaginally using a fine needle.
   • Indications: A critical step in the IVF process to obtain oocytes for fertilization.
8. Stem Cell Utilization (Future Method)
   • Description: A potential future technique using stem cells to generate eggs or sperm.
   • How It Works: Stem cells are cultured and differentiated into gametes in the laboratory.
   • Indications: Cases where natural gamete production is severely compromised (currently experimental).
9. Ovarian Rejuvenation
   • Description: Treatments aimed at reactivating ovarian function.
   • How It Works: Cell therapies or other interventions may be used to stimulate follicular development.
   • Indications: Women with diminished ovarian reserve or early menopause.