What IVF actually is
IVF — in vitro fertilisation — is a form of assisted reproduction. Eggs are retrieved after the ovaries have been stimulated, fertilised with sperm in a laboratory, and the resulting embryos are cultured and then transferred to the uterus. Where a single sperm is injected directly into an egg, the technique is called ICSI. Any surplus embryos may be frozen — the technical term is vitrified — and kept for a later transfer.
That is the whole arc in one sentence, but each step takes time, and the lab work in the middle is what makes IVF different from simpler fertility treatments. This page is the clinical explainer only: what an IVF cycle is, how long it takes, how it differs from IUI, how donor-egg cycles differ from own-egg cycles, what really drives success, and what the price leaves out. Questions about who can be treated, and about egg, sperm or embryo donation and surrogacy, are legal questions specific to each country — for the Serbian framework and Belgrade specifics, see our dedicated IVF and fertility in Belgrade coverage. Nothing here is medical advice; it is a general explainer, not a substitute for a fertility specialist.
IUI vs IVF: how IVF differs from simpler treatment
Before IVF, many patients encounter a simpler option, IUI — intrauterine insemination — and it helps to be clear on the difference. IUI places prepared sperm directly into the uterus around the time of ovulation. There is no egg retrieval and no fertilisation in a laboratory; conception, if it happens, still occurs inside the body. It is less involved, lower-cost, and lower-success-per-attempt.
IVF is the more involved treatment. Eggs are physically retrieved, fertilised in the lab — by conventional IVF or by ICSI — and the resulting embryos are cultured before one is transferred. It costs more and asks more of the patient, but it generally carries higher success per attempt and can address more causes of infertility, including male-factor cases through ICSI. Which treatment is appropriate depends entirely on the underlying cause, and that is a clinical judgement for a fertility specialist rather than something a price list can answer.
What are the stages of an IVF cycle?
A typical cycle moves through several distinct stages, in order:
- Ovarian stimulation. Hormone medication encourages the ovaries to mature several eggs at once, rather than the single egg of a natural cycle.
- Monitoring. Scans and blood tests track how the ovaries are responding, so the medication and timing can be adjusted.
- Trigger and egg retrieval. A trigger injection matures the eggs, and they are collected in a short procedure carried out under sedation.
- Fertilisation in the lab. The retrieved eggs are fertilised — either by conventional IVF, where eggs and sperm are placed together, or by ICSI, where a single sperm is injected into each egg.
- Embryo culture. The resulting embryos are grown over several days, sometimes to the blastocyst stage, while embryologists watch how they develop.
- Embryo transfer. One or more embryos are placed into the uterus.
- The wait, then a test. A waiting period, commonly around two weeks, precedes the pregnancy test.
Not every transfer happens in the same cycle as the retrieval. A frozen embryo transfer, or FET, uses embryos that were vitrified earlier and thawed for a later attempt. This matters for both timing and budgeting, because an FET is a separate procedure from the original retrieval — a point that resurfaces when you read a price quote.
How long does an IVF cycle take?
It is better to think in weeks than in days. From the start of stimulation to the pregnancy test, a single fresh cycle commonly spans a few weeks: roughly one to two weeks of stimulation and monitoring, then retrieval, then several days of embryo culture before transfer, then the roughly two-week wait. Some clinics deliberately freeze all embryos and transfer in a later month — a "freeze-all" approach — which separates the retrieval and the transfer into different cycles and lengthens the overall timeline. And because a single cycle is often not enough, the realistic planning horizon for many patients is several cycles spread over months, not a single visit. These are general patterns, not a fixed schedule; the exact protocol is set by the treating clinic.
How does donor-egg IVF differ from using your own eggs?
The laboratory steps — fertilisation, culture, transfer — are broadly the same whichever eggs are used. What differs is the egg source, and that difference matters most for success.
In an own-egg cycle, the patient is stimulated and her own eggs are retrieved. Because egg quality and quantity decline with age, own-egg success falls significantly as the woman gets older — this is the single strongest driver of the odds.
In a donor-egg cycle, the eggs come from another person. Outcomes then tend to track the donor's age and characteristics rather than the recipient's, which is why donor-egg success is usually reported separately and reads differently from own-egg success. The recipient's cycle is built around preparing her uterus to receive the embryo rather than around her own egg supply.
Crucially, this is a clinical and statistical distinction, not a legal one. Who is eligible for donor treatment, and the rules around egg, sperm and embryo donation and surrogacy, vary by country and are outside the scope of this page. For the Serbian eligibility framework and Belgrade specifics, see IVF and fertility in Belgrade.
What factors affect IVF success rates?
This is the part most worth understanding before you decide anything. The honest summary is that success is strongly age-dependent and lower than headline marketing implies, and that no single number describes everyone.
The single biggest factor is the woman's age when using her own eggs, because egg quality and quantity decline over time; per-cycle live-birth rates drop markedly at older ages. Beyond age, the things that move the odds include the underlying cause of infertility, ovarian reserve, sperm quality, embryo quality, whether genetically tested embryos are transferred, the uterine environment, body weight, smoking, and how many cycles are attempted. A single cycle is frequently unsuccessful, and multiple cycles are common — which is why the cumulative odds over several attempts matter more than the odds of one.
Because all of this varies so much, the only meaningful success figure is one banded by age and cause. A headline rate averaged across all patients tells you very little about your own situation. Treat any number as a 2026 snapshot, not a fixed law of nature.
Why clinics' success rates aren't comparable
There is a second trap in the numbers themselves. A quoted "success rate" changes depending on what it measures, and clinics do not all measure the same thing.
A rate calculated per transfer will look higher than one calculated per cycle started, because cycles that never reach transfer are dropped from the first figure. A clinical-pregnancy rate will look higher than a live-birth rate, because not every pregnancy results in a birth — and clinics often quote pregnancy rather than live-birth figures. And a clinic treating younger patients will post better numbers than one treating older or harder cases, regardless of the quality of either lab.
Two clinics can both be telling the truth and still publish figures that are not comparable. Read carefully what any number actually counts — per cycle or per transfer, pregnancy or live birth, and for which age band — before you set it against another. These figures are indicative and perishable; treat them as a 2026 snapshot.
Common add-ons — and what they cost you
A headline IVF price rarely includes the full picture. Medication, ICSI, PGT (preimplantation genetic testing), vitrification and storage, and separate embryo-transfer or FET fees are all common add-ons, and together they can raise the real cost substantially. Some of these add-ons have limited evidence of improving live-birth rates for general patients, so they are worth weighing critically rather than accepting as standard. The right question to ask is not only "how much does it improve my chances?" but "does the evidence show it improves them at all, for someone in my situation?"
What does an IVF cycle cost internationally?
Across popular destinations, a single IVF cycle before add-ons ranges roughly €1,800 to €5,200, as of 2026. Western markets — the UK, Germany, Australia and the US — are generally at the higher end, while lower-cost European hubs sit below that. These are indicative figures drawn from cost-comparison data, and they move over time.
The headline figure, though, is the wrong number to plan around. Package prices commonly exclude medication, PGT, vitrification, storage and separate transfer fees — so the realistic all-in total can be considerably higher than the advertised price, and an FET in a later month is a further separate cost. For how this plays out alongside other procedures, our overview of medical tourism costs in Belgrade is a useful companion, and our guidance on risks and aftercare is worth reading before you travel for any treatment. Belgrade and Serbia prices specifically — along with the legal eligibility picture and donation rules — live on the dedicated IVF and fertility in Belgrade page rather than here.
What the marketing tends to leave out
If you remember only a few things, make them these. A single cycle often isn't enough, and planning for one attempt sets up disappointment. Success is strongly age-dependent and lower than headline figures suggest. Quoted "success rates" vary by definition — per cycle or per transfer, pregnancy or live birth — and are frequently not comparable across clinics. And the headline price is rarely the all-in cost once medication and add-ons are counted. None of this is a reason to avoid IVF — it is simply the honest baseline you need in order to ask good questions and read clinic claims with appropriate scepticism.
If you're combining a consultation with time in the city, our guide to things to do in Belgrade covers the rest of the trip. The clinical decision, though, should rest on realistic expectations: this is a process, often a repeated one, with success that depends heavily on age and on factors no brochure can promise away.
