If a long-awaited pregnancy has not occurred after twelve months of regular sexual intercourse without contraception, this is a serious medical reason to consult a qualified specialist in reproductive medicine. Modern infertility treatments mean that this problem is no longer a life-altering setback. This field is one of the central and most rapidly evolving areas in medicine, bringing together the expertise of geneticists, molecular biologists, embryologists, and endocrinologists. Thanks to the introduction of innovative technologies, such as laser microsurgery and deep genetic sequencing, a vast number of couples now have a real chance to overcome complex physiological barriers and fulfill their most cherished dream: the birth of a healthy and strong child.
How Prevalent Is Infertility in the Modern World?
According to current international statistics from the World Health Organization (WHO), infertility is a global issue that affects all segments of society, regardless of income level. Approximately 17.5% of the world’s adult population—that is, nearly one in six people on Earth—faces difficulties to some degree when trying to conceive a child.
It is important to understand that this figure is not static. It varies significantly depending on region of residence, socioeconomic conditions, and age group. In megacities and major industrial centers, the percentage of couples experiencing fertility difficulties is often significantly higher. This is due to a combination of negative factors associated with urbanization, including chronic psychological and emotional stress—which disrupts the functioning of the hypothalamic-pituitary system—an unfavorable environmental situation, and the global trend toward delayed parenthood. Today, many couples consciously plan to have their first child after the age of 30–35, when the body’s biological reserves begin to naturally decline.
Probability of Conception Based on Duration of Attempts
The process of conception is an extremely complex and finely tuned biological mechanism, the outcome of which depends on numerous variables. The statistical chances of success over different time periods are as follows:
- One menstrual cycle: The probability of becoming pregnant during a single cycle averages 11–15%. This is due to the extremely short fertility window—the period when the egg is ready for fertilization (usually 24 hours after it is released from the follicle).
- First 6 months: With regular sexual activity and no underlying medical conditions, about 60% of couples conceive within the first six months.
- First year: By the end of the twelfth month, this figure rises to 84%. This period is officially considered the medical standard for assessing a couple’s reproductive health.
- Second year: Within twenty-four months of trying, 92% of couples conceive, which underscores the importance of patience but also highlights the need for evaluation for the remaining 8%.
Special attention to age: For couples where the woman is over 35 years old, specialists strongly recommend halving the period of waiting to see if conception occurs naturally. If conception does not occur within 6 months, it is necessary to consult a reproductive specialist immediately. This is because fertility declines exponentially after age 35. The egg supply (ovarian reserve) not only decreases in quantity but also deteriorates in quality, as mitochondrial damage accumulates in the eggs. In this age group, the risk of spontaneous chromosomal abnormalities increases significantly, which can lead to missed abortions or severe fetal malformations. This is precisely why specialists recommend, in such cases, not just IVF, but cycles that include preimplantation genetic testing for aneuploidy (PGT-A).
Key Factors Affecting Fertility
Infertility is always a diagnosis that affects both partners. A family’s reproductive health depends equally on both partners, and current statistics break down the causes of fertility issues as follows:
- Female factor: This is the sole cause of infertility in 33% of cases. This includes both congenital anatomical abnormalities and acquired conditions.
- Male factor: Accounts for problems in 20% of cases. It is important to note that male infertility is often asymptomatic and is detected only through a semen analysis.
- Combined factor: When fertility issues of varying severity are diagnosed in both partners simultaneously; this occurs in 39% of cases. This further underscores the need for simultaneous testing of both the man and the woman.
- Unknown cause (idiopathic infertility): Accounts for about 8%. In such situations, even the most thorough tests fail to reveal any obvious abnormalities, which may indicate hidden immunological conflicts or psychogenic factors.
Modern high-tech diagnostic methods, such as sperm DNA fragmentation analysis or endometrial receptivity testing (ERA test), are increasingly enabling doctors to find answers even in the most complex cases and to develop personalized treatment plans.
Main Causes of Female Infertility
1. Endocrine and hormonal disorders
Hormonal balance is the foundation upon which the entire reproductive process is built. Even the slightest deviation in the functioning of the endocrine glands can make conception impossible.
- Anovulation: The failure of an egg to be released, which is often associated with thyroid or adrenal gland dysfunction.
- PCOS (Polycystic Ovary Syndrome): A systemic disorder characterized by the absence of regular ovulation and elevated levels of male hormones.
- Hyperprolactinemia: An excess of the hormone prolactin blocks the production of hormones responsible for follicle growth, mimicking the body’s state during breastfeeding.
- FSH and LH Imbalance: Disrupts the body’s normal cyclical preparation for pregnancy.
2. Tubal-Peritoneal Factor
The fallopian tubes are not merely conduits but an active environment where fertilization occurs. If the fallopian tubes are blocked due to adhesions (following infections or surgeries), it becomes physically impossible for the sperm to meet the egg. Even partial damage to the cilia inside the tube can lead to a dangerous condition known as an ectopic pregnancy.
3. Decline in ovarian reserve
This is the biological limit of the ovaries. This reserve can be depleted prematurely due to smoking (which is toxic to oocytes), previous surgeries, chemotherapy, or genetic predisposition. When the supply of eggs is critically low, the effectiveness of standard treatments decreases, and programs involving donor eggs come to the forefront.
4. Endometriosis
This is a systemic disease in which endometrium-like tissue grows on the ovaries, fallopian tubes, and peritoneum. This creates a constant source of chronic inflammation that negatively affects the pelvic environment, reducing egg quality and preventing embryo implantation.
5. Uterine Abnormalities
Any growths inside the uterus act as a mechanical barrier. Polyps can trigger a local immune response that prevents embryo implantation, while fibroids that distort the uterine cavity can disrupt blood supply to the fertilized egg, leading to pregnancy loss.
6. Immunological factors
In some cases, a woman’s body produces antisperm antibodies that render sperm immobile before they even reach their target. Autoimmune attacks on the embryo itself are also possible, as the immune system may perceive it as a foreign body.
Main Causes of Male Infertility
Male reproductive health is extremely vulnerable to environmental factors. The main causes include:
- Sperm abnormalities: Oligospermia (low sperm count), asthenospermia (poor motility), and teratospermia (abnormal morphology), which prevent sperm from penetrating the egg’s membrane on their own.
- Varicocele: Varicose veins in the scrotum, which cause blood stagnation and overheating of the testicles. Since spermatogenesis requires a temperature 2–3 degrees lower than body temperature, even slight overheating leads to cell death.
- Hidden infections: Past inflammatory diseases often lead to obstruction of the seminal ducts.
- Oxidative stress: The accumulation of free radicals due to unhealthy habits and environmental pollution damages sperm DNA.
Diagnosis and Identification of Causes
To make an accurate diagnosis, modern fertility clinics use a systematic algorithm:
- Hormone profile: Assessment of ovarian reserve through an AMH (anti-Müllerian hormone) test and evaluation of thyroid function.
- Expert ultrasound: Dynamic monitoring of follicular growth and endometrial condition during different phases of the cycle.
- Comprehensive semen analysis: Including Kruger morphology assessment and the MAR test for antibodies.
- Fallopian tube patency testing: Minimally invasive methods (echo-HSG) to assess the anatomical integrity of the fallopian tubes.
- Genetic screening: Analysis of the spouses’ karyotypes to rule out hereditary causes of infertility.
A modern arsenal of treatment methods
Today, reproductive medicine is capable of addressing issues of virtually any complexity:
- Ovulation induction: The use of mild hormonal medications to stimulate ovarian function.
- Intrauterine insemination (IUI): Sperm processed in the laboratory is injected directly into the uterus at the time of ovulation, bypassing the cervix (relevant in cases of a so-called cervical factor).
- IVF (In Vitro Fertilization): Fertilization in the strictly controlled environment of an incubator.
- ICSI (Intracytoplasmic Sperm Injection): A precision technique used in cases of male infertility, in which an embryologist manually injects a single, high-quality sperm into the egg.
- PGT-A (Preimplantation Genetic Testing): Screening the embryo for genetic health before transfer, which maximizes the chances of success.
Special attention is given to IVF with egg donation or double-donor IVF programs, which make it possible to achieve pregnancy even in the absence of the patient’s own gametes, ensuring a high probability of giving birth to a healthy child.
Effectiveness and Chances of Success
Statistics in reproductive medicine are constantly improving thanks to advancements in culture media and equipment:
- IVF: For young patients (under 35), the success rate on the first attempt reaches 50–54%, which is significantly higher than with natural conception. After age 40, this rate is approximately 20–30%, but can be significantly increased with the use of PGT-A.
- ICSI: This method achieves success in 60–70% of cases, even with critically low semen analysis results.
It is important to remember that the effectiveness of these programs is cumulative. Each subsequent attempt or transfer of frozen embryos (cryoprotocol) brings the couple closer to the desired outcome.
Why It’s Important Not to Delay Seeing a Doctor
Fertility is the most valuable and irreplaceable resource. The sooner a couple acknowledges the problem and seeks professional help, the more tools doctors will have at their disposal. Modern treatment protocols are becoming increasingly personalized, gentle, and focused on women’s safety.
The NatuVitro Clinic is a place where cutting-edge scientific achievements meet sincere care for each patient. We offer a full cycle of support, from initial in-depth diagnostics to the most complex ART programs using genetic screening. Our goal is not just a positive pregnancy test, but the birth of your long-awaited, healthy baby.
Frequently Asked Questions About Infertility
1. How long should you try to conceive on your own? If you’re under 35, about one year. If you’re over 35, no more than six months. However, if you experience pain, have an irregular cycle, or have undergone pelvic surgery, you should see a doctor sooner.
2. How risky is IVF for a woman’s health? Modern stimulation protocols use minimal doses of medication, and egg retrieval methods are minimally invasive. The risk of complications (such as hyperstimulation syndrome) is now minimized thanks to a personalized approach.
3. Does stress affect the success of treatment? Yes, high cortisol levels can negatively affect the quality of ovulation and the receptivity of the endometrium. At our clinic, we place great emphasis on the psychological well-being of our patients throughout the entire treatment protocol.
4. Is it possible to choose the sex of the child during IVF? According to the laws of many countries, sex selection is permitted only for medical reasons to prevent sex-linked hereditary diseases. However, the PGT-A genetic test allows us to confirm the absence of chromosomal abnormalities in embryos of any sex.
5. What should you do if your first IVF attempt was unsuccessful? Failure on the first attempt is no reason to despair; rather, it provides important diagnostic information for your doctor. Analyzing the causes—such as embryo quality, ovarian response, and endometrial condition—allows the protocol to be adjusted and significantly increases the chances of success on the second attempt.
