Who Is IVF Suitable For?

IVF treatment is one of the assisted reproductive methods considered in cases where pregnancy cannot occur naturally or the likelihood of conception is significantly reduced. The question “what is IVF” is often asked not only to understand the definition of the method, but also to learn who may be a candidate for this process. The basic principle of the IVF approach is to medically support the process when the egg, sperm, and intrauterine environment cannot come together at the necessary stages for pregnancy. For this reason, the evaluation does not focus only on the woman or only on the man; the couple is assessed together. In some couples, the issue is related to the fallopian tubes, while in others, ovulation pattern, ovarian reserve, or sperm parameters may be the determining factors. In some cases, pregnancy may still not occur even when basic evaluations do not show a clear cause; this is referred to as unexplained infertility, and the options are again planned individually. To make the process easier to understand, phrases such as “how does IVF work” and “IVF process” are also frequently used, because most people want to know not only the candidacy criteria but also what they may encounter.

In Which Situations Does IVF Come Into Consideration?

IVF is not considered the first option for every couple; it usually comes into consideration by taking age, duration of trying to conceive, accompanying diagnoses, and previously used methods into account. Evaluation is made when pregnancy does not occur within a certain period despite regular and unprotected intercourse; however, the interpretation of this period changes with age. As age advances, ovarian reserve may decrease, making timing more critical. For this reason, in some couples, planning may be made earlier rather than waiting. Here, the phrase “IVF treatment” includes not only an application, but also the right timing.

In addition, IVF may be considered earlier if there is a history of recurrent miscarriage, previously known tubal blockage, severe endometriosis, marked ovulation disorder, or advanced problems on sperm testing. In some couples, it may be possible to proceed for a while with methods such as ovulation tracking or insemination; however, when age factor, ovarian reserve, and clinical history are considered together, IVF may become a more suitable option. The important point here is to establish the most realistic plan according to the couple’s data rather than using a “same path for everyone” approach.

Why Are Age and Duration of Trying to Conceive Important?

Age is one of the determining factors especially in terms of female reproductive capacity, because egg number and egg quality change over time. Therefore, in IVF planning, not only “how many months the couple has been trying” but also “at what age they have been trying” matters. For example, in a person in her 20s with regular cycles, it may be reasonable to proceed with a certain period of follow-up and basic evaluation, whereas in the group aged 35 and over, loss of time may become a more prominent risk.

At this point, AMH testing and ultrasound findings may provide information about ovarian reserve; however, no definite judgment is made based on a single test, and the overall picture is considered. As the process gets longer, stress may increase for couples and timing intercourse may become more challenging; this can strengthen the feeling of “we are trying but it is not happening.” IVF may be an option that reduces this uncertainty, because the process is planned in a controlled way. Still, success is not the same at every age; the factors affecting success change with age. Therefore, IVF evaluation should be an approach that considers age and duration together and aims to build realistic expectations.

Which Tests Are Performed Before IVF?

The tests performed before IVF planning are necessary both to determine appropriate candidacy and to guide the process in a safe and targeted way. On the female side, ovarian reserve and ovulation-related evaluation are performed; AMH testing, hormones such as FSH, and ultrasound findings are interpreted together. Since the intrauterine environment and the condition of the tubes also affect planning, HSG or, when necessary, intrauterine evaluations may come to the agenda. On the male side, semen analysis is the basic test; additional evaluations may be planned if needed. The purpose of these tests is not “the more tests, the better”; it is to address the most common causes in the right order and reduce unnecessary repetition. While the IVF process is being planned, there are stages such as medication use, stimulation of the ovaries, egg retrieval, and embryo transfer; supportive controls are carried out for each of these stages to ensure safe progress. For this reason, the tests should be considered not as a list, but as tools that guide the steps of the process. In addition, previous treatment attempts, past surgeries, or chronic diseases may change the plan in some couples; this information should also definitely be included in the evaluation.

Who Is IVF Suitable For in Female-Related Causes?

In female-related causes, IVF comes into consideration when one of the stages required for pregnancy becomes significantly more difficult. One of the most common reasons is related to the fallopian tubes. The tubes need to be open for the egg and sperm to meet naturally; when tubal blockage or tubal damage is detected in evaluations such as HSG (hysterosalpingography), this meeting becomes difficult. In this situation, the IVF approach may increase the chance of pregnancy by bypassing the “tubal stage,” since fertilization takes place in the laboratory. In some individuals, the tubes may not be completely blocked, but tubal function may still be impaired after past pelvic infections or surgeries; in this case, the decision is based not only on the “open-closed” distinction, but also on whether the tube is functionally effective.

Other topics affecting IVF planning on the female side are generally centered around ovulation and ovarian reserve. In ovulation disorders (including PCOS), irregular ovulation may be seen; in some individuals ovulation can be achieved with medication, while in others IVF may become a more suitable option when attempts are prolonged. Endometriosis, on the other hand, may affect ovarian function and can also create adhesions in the tissues around the tube and uterus, making natural conception more difficult. The intrauterine environment is at least as important as the egg; polyps, certain fibroids growing into the uterine cavity, or adhesions may make embryo implantation more difficult. In such cases, evaluation of the uterine cavity and correction if necessary are included in the planning.

The situations that commonly accompany the consideration of IVF in female-related causes can be summarized as follows:

• Tubal blockage or tubal damage (HSG findings)

• Presence of advanced endometriosis or ovarian endometrioma

• Failure to achieve pregnancy despite induction of ovulation with medication

• Suspicion of reduced ovarian reserve (evaluated together with AMH/ultrasound)

• Conditions such as polyps, certain fibroids, or adhesions in the uterus that may affect implantation

Therefore, the definition of an “appropriate candidate” is not made according to a single diagnosis; the most realistic path is determined by evaluating age, ovarian reserve, cycle pattern, the condition of the tubes, and the intrauterine environment together.

Who Is IVF Suitable For in Male-Related Causes?

Male factor infertility is a main topic in IVF evaluation and is often addressed at an early stage of the process. This is because the basic evaluation on the male side, semen analysis (sperm test), provides quick and guiding data. In semen analysis, parameters such as sperm count, motility, morphology, and semen volume are examined. While different methods may be considered in mild impairments, some situations bring IVF into consideration earlier. Especially when sperm count is very low, motility is markedly impaired, or morphology is severely affected, IVF may become a more meaningful option.

At this point, the intracytoplasmic sperm injection (ICSI) approach becomes important. In ICSI, a single sperm is injected directly into the egg; this method may help increase the chance of fertilization especially in cases where sperm parameters are significantly affected. Another issue to consider in male factor infertility is that a single semen analysis result does not always provide the final decision. Febrile infections, recently experienced illnesses, intense stress, lack of sleep, smoking, and some medications may cause temporary fluctuations. Therefore, in some cases, repeating the test or clarifying the picture with additional evaluations may be necessary. However, when a marked and persistent impairment is detected, it becomes important to establish the appropriate plan without losing time.

The situations in which IVF more frequently comes into consideration in male factor infertility can be summarized as follows:

• Markedly low sperm count and/or motility

• Severe morphology disorder

• Strengthening of the sperm factor in couples with a history of repeated unsuccessful attempts

• Suspicion of obstruction or certain conditions affecting sperm outflow

• Degree of parameter impairment that may require ICSI

As a result, in male-related causes, IVF planning is created not only based on “whether there is sperm or not,” but by evaluating the level and persistence of sperm parameter changes together with the couple’s overall infertility history. This approach allows the process to progress in a more targeted and understandable way.

In addition, it is not appropriate to proceed with a “go straight to IVF” approach before the couple’s evaluation is completed; because in some cases, results may be obtained with simpler methods or steps that clarify the diagnosis may first be needed. In short, the answer to the question “who is not suitable for IVF” does not describe a strict list of prohibitions, but rather explains in which situations preparation and correction are needed first for the process to progress safely and meaningfully.

Which Factors Affect Success in the IVF Process?

Success in IVF does not depend on a single factor; it generally increases when multiple factors are managed well at the same time. Age, ovarian reserve, egg and sperm quality, embryo development, and the intrauterine environment all play a role in this process together. Therefore, an approach such as “one protocol gives the same result for everyone” would not be correct. Throughout the TIVF process, the aim is to support the strongest points at every step and control the factors that may make the process more difficult as much as possible.

The main factors affecting success are grouped under the following headings:

• Age and ovarian reserve

• Egg and sperm quality

• Embryo development and transfer day planning

• Intrauterine environment and endometrium

• Lifestyle and overall health balance

• Applied treatment protocol and follow-up schedule

Age and ovarian reserve: As age advances, the likelihood of egg quality being affected may increase; this may influence both the number of eggs obtained and embryo development. In evaluating ovarian reserve, AMH and ultrasound findings are interpreted together; the level of reserve may affect the response to medications and the number of eggs that can be retrieved. Therefore, the same treatment plan may produce different results in different age groups or different reserve levels.

Egg and sperm quality: On the female side, the maturity and quality characteristics of the egg affect the developmental potential of the embryo. On the male side, sperm count, motility, and morphology may be determining factors at the fertilization stage. In some cases, planning intracytoplasmic sperm injection (ICSI) may be necessary; this decision is made together with semen analysis findings and the couple’s history. Since sperm parameters may be influenced by current health status, febrile illnesses, smoking, sleep pattern, and stress, the evaluation is not limited to a single result.

Embryo development and transfer planning: Embryo development after fertilization is related both to egg-sperm quality and laboratory conditions. The planning of the transfer day is made by considering the course of embryo development and the suitability of the intrauterine environment. Some couples may achieve a result with a single transfer, while others may require longer planning; this does not mean that the process is “unsuccessful,” but often reflects biological variability.

Intrauterine environment and implantation conditions: For the embryo to implant, the intrauterine environment must be suitable. The structure of the endometrium, the presence of polyps, adhesions, or certain types of fibroids that may make embryo implantation difficult play an important role in the process. Therefore, in some cases, evaluation of the uterine cavity before IVF and making the necessary corrections are included in the planning.

Lifestyle and overall health: Lifestyle factors cannot be described as “determining the outcome on their own”; however, they are important in the process because they affect overall health balance. In particular, smoking, significant excess weight, irregular sleep, insufficient physical activity, and intense stress may have negative effects on reproductive health. For this reason, maintaining regular sleep, balanced nutrition, controlled activity, and habits that reduce stress load as much as possible throughout the process are supportive.

Treatment protocol and follow-up: The medication protocol applied is individually adjusted according to the ovarian response. Drug doses and the frequency of follow-up are adjusted with ultrasound and, when necessary, hormone measurements. The aim here is not “to give the highest dose,” but to establish a balance that will produce the most appropriate response. This approach is one of the most important reasons why the IVF treatment plan is personalized.

Finally, cost is also a commonly asked topic; however, IVF prices cannot be explained with a single figure. The selected protocol, medications used, additional procedures, and the scope of follow-up affect the total cost. Understanding the process well helps build more realistic expectations and reduce confusion at the decision stage.

Frequently Asked Questions About IVF