In vitro fertilization, or IVF, is a fertility treatment where eggs are collected from the ovaries, fertilized with sperm in a laboratory, and then placed back into the uterus as embryos. A single cycle takes roughly two to six weeks from start to finish, costs $15,000 to $25,000 including medications, and results in a live birth about 53% of the time for women under 35, with success rates declining significantly with age.
Who IVF Is For
IVF was originally developed for women with blocked or damaged fallopian tubes, but it’s now used for a wide range of fertility challenges. These include low sperm count or poor sperm quality, endometriosis, ovulation disorders, unexplained infertility, and age-related fertility decline. It’s also an option for people using donor eggs or sperm, same-sex couples, and individuals who want to preserve fertility by freezing embryos before cancer treatment or for other reasons.
Some couples try IVF after less intensive treatments haven’t worked. A common first step is intrauterine insemination (IUI), where sperm is placed directly into the uterus during ovulation. IUI is simpler and cheaper, but it’s also less effective: one study found IVF produced a live birth rate of about 41% compared to 27% for IUI. For patients under 30, IVF achieved pregnancy 52% of the time versus 39% for IUI. The gap narrows somewhat with age but remains consistent, which is why many fertility specialists recommend moving to IVF after two or three unsuccessful IUI cycles.
How the Process Works, Step by Step
Initial Testing
Before a cycle begins, both partners undergo evaluation. For the woman, this means testing ovarian reserve, which measures how many eggs the ovaries are likely to produce. Imaging of the uterus checks for structural issues like fibroids or polyps that could interfere with implantation. The male partner provides a semen sample to assess sperm count and quality. Both partners are screened for infectious diseases. These results shape the treatment plan and help the medical team set realistic expectations.
Ovarian Stimulation
The first active phase of the cycle involves injectable hormone medications that prompt the ovaries to develop multiple eggs at once, rather than the single egg a body normally releases each month. This stage lasts 10 to 14 days, depending on how quickly the follicles (the fluid-filled sacs that contain eggs) grow. During this time, you’ll have regular ultrasounds and blood draws, typically every two to three days, so your doctor can track follicle development and adjust medication doses. The goal is to mature as many eggs as possible, since not every egg will successfully fertilize or develop into a viable embryo.
Egg Retrieval
Once the follicles reach the right size, a trigger shot signals the eggs to complete their final maturation. Exactly 34 to 36 hours later, the eggs are collected in a short procedure done under sedation. A thin needle guided by ultrasound passes through the vaginal wall to reach the ovaries and aspirate the fluid from each follicle. The whole thing takes 10 to 30 minutes. Most people feel crampy and bloated afterward but return to normal activities within a day or two.
Fertilization
On the same day as retrieval, the eggs are combined with sperm in the lab. In conventional insemination, thousands of sperm are placed with each egg in a dish and left to fertilize naturally over 12 to 18 hours. When sperm quality is a concern, a technique called ICSI is used instead: a single sperm is injected directly into each egg. By the next morning, the embryology team can see which eggs have fertilized.
Embryo Development and Transfer
Fertilized eggs are cultured in the lab for three to five days. A day-three embryo has divided into about eight cells. By day five, it’s reached the blastocyst stage, a more advanced structure of roughly 100 cells. Many clinics prefer to transfer blastocysts because they have a better chance of implanting. During the transfer itself, which takes about 10 to 15 minutes and requires no sedation, a thin catheter is threaded through the cervix and guided by ultrasound to place the embryo about 1 to 2 centimeters from the top of the uterus. You’ll start progesterone supplementation around this time, either as injections or vaginal suppositories, to help the uterine lining support implantation.
Any high-quality embryos that aren’t transferred can be frozen for future use, which means you may not need to repeat the stimulation and retrieval phases if a second attempt is needed.
Success Rates by Age
Age is the single biggest factor in IVF outcomes. The Society for Assisted Reproductive Technology tracks results from clinics across the U.S. and reports live birth rates per egg retrieval using the patient’s own eggs (2023 data):
- Under 35: 53.2%
- 35 to 37: 39.9%
- 38 to 40: 26.2%
- 41 to 42: 13.2%
- Over 42: 4.1%
These numbers reflect a single retrieval cycle. Cumulative success over multiple cycles is higher. Many people under 35 who don’t succeed on the first attempt will conceive on a second or third cycle. For women over 40, using donor eggs from a younger woman brings success rates back up to the under-35 range, since egg quality is what drives the age-related decline.
Risks and Side Effects
The most talked-about risk of IVF is ovarian hyperstimulation syndrome (OHSS), a reaction to the hormone medications where the ovaries swell and leak fluid into the abdomen. Mild OHSS is common: bloating, nausea, and discomfort that resolves on its own within a few days. Moderate to severe OHSS occurs in roughly 1% to 5% of cycles and can cause significant abdominal swelling, difficulty breathing, rapid weight gain (more than a kilogram in 24 hours), and in rare cases, blood clots or kidney problems. Severe OHSS sometimes requires hospitalization. The risk has decreased in recent years as clinics have adopted newer trigger medications and strategies like freezing all embryos instead of doing a fresh transfer when OHSS is developing.
Multiple pregnancies are another concern. Transferring more than one embryo raises the chance of twins or triplets, which carry higher risks for both mother and babies. In one study comparing IVF and IUI outcomes, multiple pregnancies occurred in about 16% of IVF cases. The trend in modern IVF is toward single embryo transfer, which dramatically reduces this risk while maintaining strong pregnancy rates.
Early miscarriage rates in IVF are similar to natural conception, around 10% to 12% of confirmed pregnancies. The egg retrieval procedure itself carries a small risk of bleeding or infection, but serious complications are rare.
Genetic Testing of Embryos
Before transfer, embryos can be screened for chromosomal abnormalities through preimplantation genetic testing. A few cells are biopsied from each blastocyst and analyzed, allowing the team to identify embryos with the correct number of chromosomes. Embryos with extra or missing chromosomes are the leading cause of failed implantation and early miscarriage. Selecting chromosomally normal embryos for transfer improves the chance of a successful pregnancy and reduces miscarriage risk, which is particularly valuable for women over 35 or couples with a history of recurrent pregnancy loss. Testing can also screen for specific inherited genetic conditions like cystic fibrosis or sickle cell disease when parents are known carriers.
What IVF Costs
In the United States, a single IVF cycle runs $12,000 to $18,000 for the medical procedures alone. Medications are typically billed separately and add $3,000 to $5,000. Optional services like genetic testing, embryo freezing, and frozen embryo storage push the total higher. All in, most people spend $15,000 to $25,000 per cycle.
Insurance coverage varies enormously. Some states mandate fertility coverage, others don’t. Even in states with mandates, plans may cap the number of covered cycles or exclude certain services. Many clinics offer payment plans, and some people pursue treatment at clinics abroad where costs can be a fraction of U.S. prices. Given that many patients need more than one cycle, financial planning is a practical reality of IVF that’s worth addressing early in the process.
The Emotional and Physical Experience
The physical demands of IVF are real but manageable for most people. The stimulation phase involves daily injections, which many patients learn to self-administer at home. Side effects from the hormones include bloating, breast tenderness, mood swings, and fatigue. The retrieval day itself means a few hours at the clinic and a day of rest. The transfer is quicker and easier, with no recovery time needed.
The harder part for many people is the emotional toll. The two-week wait between embryo transfer and the pregnancy test is notoriously stressful. The cycle can feel all-consuming, and the possibility of it not working weighs heavily. Couples who go through multiple cycles often describe a cumulative emotional burden that’s harder to manage than the physical side. Many fertility clinics now offer counseling or support groups, and connecting with others going through the same process can make a meaningful difference.