IVF & Infertility
IVF and Infertility Guide
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Op. Dr. Berrak Beyoğlu Oruç·April 1, 2026·11 min readA practical guide covering infertility evaluation, ovulation tracking, AMH, IUI, IVF, embryo transfer planning, and success rates.
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Guide Intro
Infertility and IVF planning do not begin only with advanced treatment options. The process starts with correct timing, the right diagnostic steps, and a personalized treatment plan. Ovulation tracking, baseline testing, ovarian reserve assessment, intrauterine insemination, and IVF all have their place in the fertility journey depending on the patient's age, history, and clinical findings.
This guide brings together the main topics from the first infertility evaluation through embryo transfer planning, success rates, and uterine cavity assessment. The content is educational and should not replace direct physician evaluation.
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When Should You Seek Help to Conceive?
Most couples who are trying to conceive will achieve pregnancy within the first year if they have regular unprotected intercourse. In general, infertility evaluation is recommended when pregnancy has not occurred after one year of regular unprotected intercourse. The goal of this evaluation is to assess both female and male factors together and to guide the next steps correctly.
Female age is one of the most important factors affecting fertility. In women aged 35 and older, ovarian reserve and oocyte quality may decline more rapidly, so evaluation is usually recommended after 6 months rather than waiting a full year. This helps avoid unnecessary delay and allows earlier treatment planning when needed.
Evaluation may also be recommended earlier if there are menstrual irregularities, ovulation problems, severe dysmenorrhea, a history of pelvic infection, endometriosis, previous abdominal or uterine surgery, or a known male-factor issue. Early and accurate assessment often helps the process feel more manageable both physically and emotionally.
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I Have Regular Periods. What Are My Chances of Getting Pregnant This Month?
In a healthy woman with regular cycles and regular ovulation, the chance of conception in a single menstrual cycle is about 20-25 percent. This means that not becoming pregnant in any given month is common and does not automatically indicate a problem.
This probability changes with age. Monthly fertility is highest in the early reproductive years and gradually declines from the mid-30s onward. After the age of 35, both egg number and egg quality usually decrease, and monthly conception rates may become significantly lower.
Even though the monthly chance is around 20-25 percent, about 80-85 percent of couples will conceive within one year of regular unprotected intercourse. For this reason, evaluation is commonly recommended after one year, although age and additional risk factors may shorten that waiting period.
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Ovulation Tracking
In women with regular cycles, ovulation usually occurs about 14 days before the next expected period. One practical way to track ovulation at home is to know the cycle length and estimate the fertile window accordingly. For example, in a 28-day cycle, ovulation often occurs around day 14, but this can vary by several days from one person to another.
Ovulation predictor kits are one of the most commonly used home tools. These urine tests detect the luteinizing hormone surge and usually indicate that ovulation is likely to occur within the next 24-36 hours. The most fertile period is generally the 2-3 days before ovulation and the day of ovulation itself, so intercourse every other day or daily during that window may improve the chance of conception.
Because the egg remains fertilizable for only about 24 hours after ovulation, the most important goal is to identify the fertile window before ovulation rather than after it has already passed. Some women also notice bodily clues such as increased clear, slippery cervical mucus or mild pelvic discomfort around ovulation.
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One Year Has Passed Without Pregnancy. Which Tests Should Be Done?
When pregnancy has not occurred after one year of regular unprotected intercourse, infertility evaluation is usually recommended. This assessment is designed to investigate both female and male factors together. Testing is often planned in a stepwise way and should be tailored to the patient's history and findings rather than applying the same panel to every couple.
For women, the initial evaluation usually includes gynecologic examination and ultrasound to assess the uterus and ovaries. Hormone tests such as AMH, FSH, LH, estradiol, thyroid function tests, and prolactin may be requested depending on the clinical picture. These help assess ovulation and ovarian function.
Assessment of the uterine cavity and fallopian tubes is also important. HSG may be used to evaluate tubal patency and the uterine cavity. When needed, hysteroscopy or additional imaging may be considered. Semen analysis is recommended for the male partner because male-factor infertility accounts for a substantial proportion of cases.
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What Do Ovarian Reserve and AMH Mean?
Ovarian reserve refers to the number of follicles in the ovaries that still have reproductive potential. Women are born with a finite follicle pool, and this reserve gradually decreases over time. Ovarian reserve is an important concept in fertility planning, but it does not by itself determine whether pregnancy will or will not happen.
AMH, or Anti-Mullerian Hormone, is secreted by small developing follicles in the ovary and is used as an indirect marker of reserve. AMH can be measured on any day of the menstrual cycle. A low AMH level may suggest reduced follicle number, while a higher AMH level may suggest a greater follicle pool.
However, AMH does not directly predict whether a woman can conceive naturally, and it does not measure egg quality. Fertility depends on many factors beyond ovarian reserve, including age, ovulation, sperm quality, tubal patency, and the uterine environment. AMH should therefore always be interpreted together with other clinical findings.
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Topic
Intrauterine Insemination (IUI)
IUI is a fertility treatment in which sperm cells are specially prepared and then placed directly into the uterus in order to improve the chance of pregnancy. The goal is to help sperm bypass the cervix and reach the egg more efficiently. IUI is often considered one of the simpler and less invasive assisted reproduction options.
The procedure is usually timed close to ovulation. Ovulation may be followed with ultrasound and, when appropriate, medication. On the day of treatment, the sperm sample is processed in the laboratory so that the most motile sperm cells can be selected and then placed into the uterus through a thin catheter. The procedure is brief and is usually well tolerated.
IUI may be recommended in selected cases such as ovulation disorders, mild male-factor infertility, unexplained infertility, or cervical-factor problems. At least one fallopian tube should generally be open, and sperm parameters should be within a usable range for the treatment to be effective.
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IVF (In Vitro Fertilization)
IVF is an assisted reproduction treatment based on fertilizing the egg and sperm in the laboratory and then transferring the resulting embryo into the uterus. It is a widely used and effective treatment for many infertility conditions when pregnancy cannot be achieved naturally.
The first stage of IVF is controlled ovarian stimulation. Medications are used to help more than one follicle develop in the same cycle. When the follicles reach adequate maturity, the eggs are collected in a short procedure. On the same day, a sperm sample is prepared, and fertilization is performed in the laboratory. In some situations, ICSI may be preferred.
Embryos are monitored in the laboratory for several days. Their developmental quality is assessed, and the most suitable embryo or embryos are selected for transfer. Embryo transfer is usually short and well tolerated. Pregnancy testing is generally performed about 10-12 days later.
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What Are IVF and ICSI?
IVF is the process of combining eggs and sperm outside the body in a laboratory setting and then transferring the resulting embryo into the uterus. It is commonly used in tubal disease, age-related infertility, unexplained infertility, endometriosis, and longstanding infertility.
In conventional IVF, the eggs and sperm are brought together in the laboratory and fertilization is expected to occur on its own. This is most suitable when sperm can still fertilize the egg adequately without direct assistance.
ICSI, or intracytoplasmic sperm injection, is a specialized form of IVF in which a single sperm is injected directly into the egg under the microscope. It is especially useful in severe male-factor infertility, in cases with prior fertilization failure, or when sperm has been obtained surgically.
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Ovarian Stimulation and Injection Treatment in IVF
Ovarian stimulation is one of the most important early steps in IVF because the aim is to obtain multiple mature eggs in the same treatment cycle. In a natural cycle, usually only one egg develops, but IVF medications are used to encourage several follicles to grow at the same time. This increases the chance of fertilization and embryo development.
These medications are generally given as subcutaneous injections. Treatment often starts on day 2 or 3 of the menstrual cycle and usually continues for about 8-12 days, depending on how the ovaries respond. Ultrasound follow-up and, when needed, hormone monitoring are used to guide the process.
Side effects are usually mild and temporary. Bloating, pelvic fullness, breast tenderness, mild headaches, emotional fluctuations, and bruising at the injection site may occur. In rare situations, ovarian hyperstimulation syndrome can develop, which is why close follow-up is important. When the follicles are ready, a trigger injection is given and egg retrieval is planned about 34-36 hours later.
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Fresh and Frozen Embryo Transfer
Fresh embryo transfer means that the embryo is transferred into the uterus in the same cycle as egg retrieval, without freezing. This approach was used for many years as the standard method and can still be appropriate in selected patients.
However, in some cycles, especially when the ovaries have been strongly stimulated, the endometrium may not be ideal for implantation. In those cases, frozen embryo transfer may be preferred. With frozen transfer, embryos are cryopreserved and transferred later in a cycle where the endometrium can be prepared more appropriately.
One important advantage of frozen transfer is that the uterus can be prepared in a more hormonally controlled or more physiologic setting. It may also increase safety in patients at risk for ovarian hyperstimulation syndrome. In appropriately selected patients, success rates with frozen transfer can be at least comparable to, and in some groups better than, fresh transfer.
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Preparing the Uterus Before Embryo Transfer
Before embryo transfer, estrogen treatment is often used to help the endometrium reach the appropriate thickness and maturity for implantation. Estrogen supports a more regular and uniform endometrial lining and helps prepare the uterus for transfer.
This preparation period usually lasts about 10-14 days, although it may vary according to the patient's response. Once the lining is considered ready, progesterone is added and embryo transfer is planned.
The choice between fresh and frozen transfer depends on many factors including age, ovarian response, hormone levels, endometrial appearance, and prior treatment history. For this reason, transfer planning should always be individualized.
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Day 3 and Day 5 Embryos
A day 3 embryo is an embryo in an earlier stage of development, usually around 72 hours after fertilization, and often contains about 6-8 cells. Day 3 transfer may be considered in cases with a limited number of embryos or when extended culture is not thought to be ideal.
A day 5 embryo has reached the blastocyst stage, where cell number is higher and inner structures are more clearly differentiated. At this stage, the embryo has separated into the inner cell mass, which will form the fetus, and the trophectoderm, which will contribute to the placenta.
One advantage of day 5 transfer is that embryo selection occurs after a longer period of natural developmental progression in the laboratory. This may support better selection of embryos with higher developmental potential and may help improve single-embryo transfer strategies. Still, day 5 transfer is not ideal for every patient, so the decision should be individualized.
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What Are IVF Success Rates and Which Factors Affect Them?
IVF success rates cannot be reduced to a single percentage because they vary significantly from patient to patient. The most important factor is female age. In general, pregnancy and live birth rates are higher in women under 35 and gradually decrease as age advances because egg number and egg quality decline.
As a broad framework, pregnancy rates per transfer in women under 35 may be around 45-60 percent, while live birth rates may be around 35-45 percent. Between 35 and 40, these rates decline gradually, and after 40 they become more limited. Even so, individual assessment remains essential.
Other important factors include embryo quality, whether the embryo is transferred on day 3 or day 5, endometrial quality, infertility duration, and the underlying diagnosis. Laboratory quality, embryology experience, and personalized treatment protocols also influence outcomes.
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Cumulative Success: Pregnancy Chances After 3 Transfers
When evaluating IVF outcomes, cumulative success rates across repeated transfers are often more meaningful than the result of a single attempt. If pregnancy does not occur after the first embryo transfer, this does not mean that future transfers will not work. On the contrary, when appropriate embryos remain available, the probability of success can increase across subsequent transfers.
In general terms, cumulative live birth rates after three embryo transfers may be roughly 65-80 percent in women under 35, around 45-60 percent between 35 and 40, and around 20-35 percent above 40, although these ranges depend heavily on embryo quality, uterine conditions, and the presence of additional infertility factors.
If pregnancy has not been achieved after three transfers, the process should not automatically be considered over. At that stage, strategy may need to be reassessed in a more individualized way, including embryo evaluation, transfer timing, uterine factors, and hormonal or other contributing issues.
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What Is HSG (Hysterosalpingography)?
HSG is a special X-ray examination used to evaluate the uterine cavity and whether the fallopian tubes are open. It is one of the most commonly used diagnostic tools during infertility work-up.
During the procedure, contrast material is introduced through the cervix with a thin catheter. The shape of the uterine cavity and the passage of contrast through the tubes are then assessed on imaging. HSG is usually scheduled after menstrual bleeding has ended and before ovulation, often in the early follicular phase.
HSG is useful not only for assessing tubal patency but also for identifying uterine anomalies, polyps, fibroids, adhesions, or changes related to prior infection. Mild cramp-like pain or light spotting may occur after the procedure, but serious complications are uncommon. When used in the right setting, HSG is a valuable step in fertility evaluation and treatment planning.
Important Note
The content is for informational purposes; definitive diagnosis and treatment require physician evaluation.
Tags
#Pregnancy#Nutrition#Women Health#IVF & Infertility
Op. Dr. Berrak Beyoğlu Oruç
Obstetrics and Gynecology Specialist
I care about offering each patient a personalized, clear, and reassuring follow-up and treatment plan in women’s health, pregnancy care, and surgical processes.
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