IVF: stages, chances of success, risks and the legal framework

IVF, assisted reproduction and ICSI: what are the differences?

Medically assisted reproduction, known in France as AMP or PMA, covers several techniques. IVF is one of them, but not every assisted reproduction pathway involves fertilisation in the laboratory. Intrauterine insemination, for example, places prepared sperm inside the uterus; fertilisation is still expected to happen in the body.

In conventional IVF, the eggs collected are placed together with prepared sperm. The laboratory then observes whether fertilisation and embryo development take place. ICSI is one form of IVF: a single sperm is injected directly into a mature egg. It is indicated in particular for certain sperm abnormalities or a particular history of fertilisation.

ICSI does not guarantee that an embryo, let alone a pregnancy, will be obtained. It does not automatically make every egg fertilisable and it does not correct every cause of infertility. Its value has to be explained for your own case. A technique that is more invasive, or presented as more recent, is not necessarily preferable without a precise indication.

Embryo transfer is yet another stage. It involves placing an embryo in the uterine cavity with a catheter. Implantation then means the embryo interacting with the endometrium, the lining of the uterus. Transferring an embryo does not mean that it has implanted. The French health insurance service’s explanations of assisted reproduction techniques help to tell these steps apart.

In which situations is IVF offered?

IVF may be indicated when the fallopian tubes are absent or damaged, in certain forms of male infertility, after other treatments have failed or in certain situations involving endometriosis. Unexplained infertility can also lead to this option. The choice takes account of how long the pathway has lasted, of age, of the assessment and of the treatments already carried out.

Other situations may call for ovulation treatment, targeted surgery or insemination. IVF is therefore not a compulsory step for every difficulty in conceiving. The French health insurance service describes a pathway matched to the causes of infertility, with medical referral and sometimes assisted reproduction straight away depending on the context.

Age particularly influences the chances linked to the eggs used. Ovarian reserve indicates the response expected from stimulation, but on its own it does not sum up the possibility of a birth. A medical condition can also make pregnancy risky. The evaluation therefore has to cover both whether the treatment is feasible and your health during any pregnancy.

The assessment before in vitro fertilisation

The consultation goes over your gynaecological history, any previous pregnancies, operations, treatments and the results of earlier attempts. When a couple provides the gametes, both partners are involved in the evaluation. A male cause and a female cause can coexist; the assessment must not focus solely on the person who will carry the pregnancy.

A pelvic ultrasound scan allows the uterus and the ovaries to be studied. Hormone tests, including AMH in certain situations, help to estimate the ovarian response expected. AMH does not count exactly how many eggs remain and it is not a test of egg quality. The recommendations of the American Society for Reproductive Medicine clearly separate the response to stimulation from the potential for a birth. Its interpretation depends on age and on the other data available.

The semen analysis looks at the concentration, motility and morphology of the sperm. An abnormality may need confirmation or further tests. The absence of sperm in the ejaculate does not mean that ICSI will automatically be possible: the cause has to be established and, in some cases, surgical sperm retrieval discussed.

Screening for infection, assessment of the uterine cavity and genetic tests are adapted to your situation and to the rules of the centre. An examination of the tubes can be useful for the diagnosis or to look for an associated problem, even though IVF bypasses their role in bringing the gametes together. Genetic testing of embryos is not systematically part of every IVF cycle; it answers specific indications and a specific legal framework.

The stages of IVF, from stimulation to transfer

Ovarian stimulation and monitoring

Stimulation aims to develop several follicles, each of which may contain an egg. The hormone injections follow a protocol chosen for your profile. The dose and the timetable cannot be deduced from a universal template. The team explains how to give the injections, how to store the products and what to do if you forget a dose or run into difficulty.

Ultrasound scans and blood tests make it possible to follow the response. They can lead to the treatment being adjusted or to the transfer plan being changed. Obtaining more eggs is not always a sign of a better pathway: safety requires an excessive response to be kept in check. Stimulation can sometimes be stopped if the expected benefit becomes insufficient or the risk too high.

Triggering and egg collection

When follicular development allows it, a treatment triggers final maturation. Its timing is tied to the timing of egg collection and has to be followed precisely. If you make a mistake, contact the centre immediately for suitable instructions, rather than improvising an extra dose.

Egg collection is usually carried out through the vagina under ultrasound guidance, with appropriate anaesthetic care. The follicular fluid is collected and then examined in the laboratory to identify the eggs. Not every follicle necessarily yields a mature egg. The number visible on the scan and the number finally usable can therefore differ.

Sperm collection and the laboratory’s work

Sperm is collected or thawed according to the pathway planned. The laboratory prepares the sperm and carries out conventional IVF or ICSI depending on the indication. Identification and traceability procedures accompany every step of the handling. Ask how the centre will inform you of the results and when you will be able to speak to an embryologist.

After fertilisation, the embryos are observed as they develop. Some stop developing; not every fertilised egg leads to a transferable embryo. Culture can be continued to the blastocyst stage when that is appropriate. The stage chosen and the number of embryos available depend on the case as a whole, with no promise that longer culture improves every situation.

Fresh transfer or deferred transfer

A transfer can be carried out in the same cycle as egg collection, or deferred with suitable embryos kept in storage. The choice depends among other things on safety, on the ovarian response and on the condition of the uterus. A deferred transfer does not necessarily mean that the attempt went badly: it may be part of the initial strategy or a useful adjustment.

The transfer is done with a catheter passed through the cervix. Hormone support may be prescribed for what follows. Follow the treatment and the date of the pregnancy test given by the team. Abdominal discomfort, breast tenderness or slight bleeding are not enough on their own to conclude that the attempt has succeeded or failed.

Storing embryos and later decisions

When several embryos can be stored, the laboratory explains how they are frozen, the storage conditions and the consent procedures. Their existence does not guarantee a future pregnancy: surviving the warming process and being able to implant remain separate stages. Ask who to contact for a later transfer, how to keep your contact details up to date and what decisions will be needed if your plans as a parent change. The rules vary from one country to another; you need to know them before storage, particularly when the embryos will stay in a centre abroad.

How long does the pathway take?

The duration of an IVF cycle covers more than the days of injections. Consultations, tests, consent procedures and any waiting time for access all come before the treatment cycle. A frozen embryo transfer can take place later, with its own timetable. The total time also depends on the medical changes decided along the way.

The British regulator HFEA usually describes three to six weeks for one cycle, with variations according to the protocol. That benchmark is not a guaranteed length of stay in another country. Part of the monitoring can sometimes be arranged close to home, but only with the agreement and coordination of both teams.

Allow for availability for tests whose timing depends on your biological response. A work schedule that is too rigid, or a return ticket that cannot be changed, can create difficulties if egg collection is put back. Ask which stages require your presence and, where relevant, that of your partner. Those answers should be settled before you book any travel.

Chances of success: understanding what a percentage measures

The fertilisation rate measures the proportion of eggs fertilised; the pregnancy rate tells you about another outcome; the live birth rate is different again. A positive test can be followed by a pregnancy that ends. Comparing these indicators without telling them apart gives a misleading picture of your chances of becoming a parent.

The denominator matters too. A rate calculated per transfer does not necessarily include the cycles that produced no transferable embryo. A rate per cycle started includes more stages of the pathway. Cumulative results may cover several transfers arising from a single egg collection. Always ask which definition is being used and which period the data cover.

Age at the time the eggs are collected, where the eggs come from, the cause of infertility and your history all influence the results. A centre’s figures can reflect the profiles it accepts as much as its performance. A comparison between countries can only be interpreted if the populations and the methods of calculation are comparable.

A high percentage displayed without these details is not a personal estimate. Ask the team for an order of magnitude suited to your own case, and for the uncertainty that goes with it. IVF can succeed at the first attempt, require several cycles, or never lead to a birth. No technology can remove that uncertainty.

Risks and the signs that call for medical advice

Ovarian hyperstimulation syndrome is an excessive response to the treatment and can become serious. Severe abdominal pain, marked swelling, vomiting, difficulty breathing, rapid weight gain or passing less urine should lead you to contact the team immediately. If you have difficulty breathing or feel seriously unwell, call the emergency services. Symptoms can develop after egg collection; leaving the centre does not bring the monitoring to an end.

Egg collection carries risks of bleeding, infection or injury to a neighbouring organ, which are uncommon but possible. Pain that increases, a fever or feeling unwell all require assessment. After a positive test, unusual pain or bleeding should also be reported: an ectopic pregnancy remains possible after IVF.

Transferring several embryos increases the risk of a multiple pregnancy, with consequences for the pregnancy and for the children. The number of embryos transferred is discussed with a view to achieving a birth in the safest possible conditions. It should not be chosen simply to raise a pregnancy rate per transfer. The HFEA sets out the main risks of fertility treatment.

After the transfer, and if the attempt fails

Follow the advice on activity and keep taking your medication until the centre tells you otherwise. A test done too early can be hard to interpret. The blood test at the time planned guides what happens next; a later scan establishes how the pregnancy is developing and where it is located. A positive result is no substitute for that follow-up.

A failure cannot automatically be put down to your daily activity, a journey or a stressful period. Avoid holding yourself responsible on the basis of one isolated event. The review consultation should go back over the observable stages: response to stimulation, egg maturity, fertilisation, embryo development and transfer. It helps you decide what could be adjusted, without promising that a precise cause will always be found.

You can discuss another transfer, another egg collection, a break or a different direction. The pace has to take in your health, your experience and your resources. Psychological support can help during the wait as well as after a disappointment. It supports you through a demanding experience; it does not mean that infertility is caused by your emotional state.

France and Turkey: different conditions of access

The French framework

In France, assisted reproduction is open to couples made up of a man and a woman, to female couples and to unmarried women, subject to the legal conditions and to the medical assessment. Marriage is not a general condition of access. Pathways using donated gametes exist within a regulated framework.

The age limits differ from one procedure to another. According to the French public service portal Service-Public, eggs may be collected for assisted reproduction before the woman’s 43rd birthday, while assisted reproduction itself may be carried out before the 45th birthday of the woman who will carry the child. The limit given for the member of the couple who will not carry the child is the 60th birthday. These ceilings guarantee neither a medical indication nor financial cover up to the same age.

The Turkish framework

Turkish regulations govern assisted reproduction for married couples, using the wife’s eggs and her husband’s sperm. The regulation published by the Turkish Ministry of Health sets out, among other things, the definition of the techniques and the verification of the marriage in the file. This framework therefore does not match what is possible in France for single women, female couples or pathways that require donated gametes.

A plan for IVF in Turkey has to be confirmed as feasible medically and legally before you commit to anything. Ask for the list of documents, the translations needed and the consents required. Do not assume from a remote consultation that your final admission is secured. The conditions have to be reviewed again when you go ahead, if the regulations or your own situation have changed.

The price of IVF: comparing the whole pathway

A quote should set out the consultations, the tests, the medicines, the monitoring, the egg collection, the anaesthetic and the laboratory work. Check whether ICSI, the transfer and embryo storage are included. Storage fees and a later transfer may be billed separately. A price for one cycle does not always describe the total cost up to an attempt at pregnancy.

In France, the French health insurance service states that assisted reproduction procedures are covered in full within set limits, with a maximum of 4 IVF attempts to obtain a pregnancy. The eligibility conditions, the way attempts are counted and any costs left uncovered have to be confirmed for your own file. This rule is not a promise to reimburse any private pathway, or one carried out abroad.

For treatment outside France, obtain a written answer from your insurer before counting on any contribution. Add travel, accommodation, local tests and any return trips. Also compare the terms for cancellation on medical grounds and the costs if no transfer proves possible. A lower quote only means something if the services and the constraints are clearly comparable.

Finally, ask what evidence supports the optional extras you are offered. The HFEA identifies treatment add-ons whose effectiveness is not sufficiently established. Sophisticated imaging, an additional test or another selection method does not on its own prove an increase in births. Before choosing, you need to understand the indication, the alternatives and how follow-up is organised, including once you are back home.

Sources

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3. Human Fertilisation and Embryology Authority. (2016, March 9). In vitro fertilisation (IVF).
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5. Direction de l’information légale et administrative. (2025, February 5). Procréation médicalement assistée (PMA). Service-Public.
6. T.C. Sağlık Bakanlığı, Ankara İl Sağlık Müdürlüğü. (n.d.). Üremeye Yardımcı Tedavi Merkezi: regulation on assisted reproduction techniques and centres.
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8. Human Fertilisation and Embryology Authority. (2026, February 26). Treatment add-ons with limited evidence.
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