What to Expect During IVF: Steps, Success Rates, and the Honest Numbers
A clear look at what to expect during IVF — the steps, success rates by age, the attrition funnel, PGT-A, and the emotional reality of treatment.
IVF is the most effective fertility treatment available, and also one of the most misunderstood. This page covers the actual process step by step, what success rates really look like by age, how to think about PGT-A and embryo transfer decisions, and what the emotional experience is actually like — without the vague reassurances.
What are the steps of an IVF cycle?
IVF has five steps: ovarian stimulation, egg retrieval, fertilization, embryo development, and embryo transfer. During stimulation, injectable hormones encourage multiple follicles to grow over the course of about 10 to 14 days. Once the follicles are ready, retrieval is performed. In the lab, eggs are fertilized with partner or donor sperm, and the resulting embryos are cultured for several days as they develop toward the blastocyst stage. The best-quality embryo is then transferred to the uterus — either in the same cycle or, more commonly now, in a later frozen embryo transfer.
How long does a full IVF cycle take?
A full IVF cycle — from the start of stimulation through the pregnancy test — takes about 4 to 6 weeks. That timeline can extend depending on whether embryos are frozen for a later transfer, whether genetic testing is added, and how long it takes to prepare the uterine lining for a frozen cycle. The stimulation phase itself is typically 10 to 14 days, followed by retrieval and several days of embryo culture, with a transfer occurring either 5 to 6 days later in a fresh cycle or in a subsequent cycle after the embryos have been frozen.
What does egg retrieval involve?
The retrieval is a short outpatient procedure performed under light sedation — it takes approximately 20 to 30 minutes. A thin needle is guided through the vaginal wall under ultrasound guidance to aspirate fluid from each mature follicle and collect the eggs inside. Most people go home the same day. Recovery is typically mild — some cramping and bloating for a day or two — and most people return to normal activities within 24 to 48 hours.
What is the attrition funnel in IVF?
Not every egg retrieved becomes a viable embryo, and not every embryo becomes a baby. Each step in the process involves natural drop-off, which is referred to as the attrition funnel. A typical path starting with 12 retrieved eggs might look like: 10 mature, 8 fertilized, 4 reaching the blastocyst stage, and 2 chromosomally normal embryos after genetic testing. Those final embryos each carry a strong individual chance at success — but the number that began as 12 shrinks considerably by the end. Understanding this ahead of time helps set realistic expectations for how many eggs may need to be retrieved across one or more cycles.
What is the IVF live birth rate by age?
Per-cycle live birth rates using a person's own eggs vary significantly by age. Approximate rates are around 50% per cycle under 35, 36% at ages 35 to 37, 23% at 38 to 40, and 11 to 13% at 40 to 42. Most people need more than one cycle to achieve a live birth. With donor eggs, success rates are driven by the donor's age rather than the recipient's — per-cycle live birth rates with donor eggs are typically 50 to 55% regardless of the recipient's age.
What is PGT-A and should you do it with IVF?
PGT-A is genetic testing of embryos before transfer that screens for chromosomal abnormalities — specifically, whether an embryo has the correct number of chromosomes. It doesn't improve the total probability of achieving a baby from a given retrieval cycle, but it can reduce miscarriage risk and helps avoid transferring embryos that are unlikely to implant. Whether PGT-A makes sense depends on your age, the number of embryos available, and your provider's recommendation — it's a question worth discussing before starting a cycle rather than after retrieval, both for clinical and cost planning reasons.
Is a fresh or frozen embryo transfer better?
Most clinics now perform freeze-all cycles — all embryos are frozen after retrieval and transferred in a separate, later cycle rather than immediately. Outcomes are comparable or better with frozen transfers for most patients. The approach also offers meaningful advantages: it allows time for PGT-A genetic testing, lets the ovaries recover from stimulation before a transfer is attempted, and enables the uterine lining to be optimized in a cycle dedicated entirely to that preparation.