Fertility & IVF
IUI vs IVF: Differences, Who Each Is For and How to Choose
IUI (intrauterine insemination) places washed, concentrated sperm directly into the uterus around ovulation, so fertilization still happens inside the body. IVF (in vitro fertilization) retrieves eggs, fertilizes them in a lab, and transfers an embryo into the uterus. IUI is simpler, less invasive and cheaper per cycle. IVF has higher success per cycle for most causes of infertility and is the main option when tubes are blocked or sperm counts are very low.
The question most people are really asking is: "Should I spend months on IUI, or go straight to IVF?" The honest answer depends on three things: your age, your test results, and how much time and money you can spend. Here's how to think it through.
IUI vs IVF at a glance
| IUI | IVF | |
|---|---|---|
| Where fertilization happens | Inside the body (fallopian tube) | In the lab |
| Medicine | None, or oral pills (letrozole or clomiphene), sometimes low-dose injections | Daily hormone injections for about 8 to 14 days |
| Procedures | Quick in-office insemination, no anesthesia | Egg retrieval under sedation, then embryo transfer |
| Monitoring | A few ultrasounds and blood tests | Frequent ultrasounds and blood tests |
| Needs open fallopian tubes | Yes, at least one | No |
| Extra embryos to freeze | No | Often yes |
| Cost per cycle | Lower | Much higher |
| Success per cycle | Lower | Higher for most diagnoses |
| NY insurance mandate | Basic infertility care, including IUI, for insured plans | Three cycles for insured large-group plans |
Prices vary widely by clinic and insurance, so ask each clinic for a written estimate.
What an IUI cycle is actually like
- Day 3 to 7 (or so): pills, maybe. You may take an oral ovulation medicine, usually letrozole or clomiphene, for five days early in your cycle. Some IUIs are done in a natural cycle with no medicine.
- Around day 10 to 12: an ultrasound to see how many follicles are growing. Expect an early-morning monitoring appointment; many NYC clinics run them before work hours.
- Timing. A home ovulation test or a "trigger" shot sets the timing.
- IUI day: sperm prep. A partner or donor sample is "washed" to concentrate the most active sperm. If your partner is giving a fresh sample, it's usually collected at the clinic or brought in within a set time window.
- The insemination. A thin catheter places the sperm in the uterus. It takes a few minutes and feels a lot like a Pap test. You can go back to work afterward.
- About two weeks later: pregnancy test. That wait is often the hardest part.
IUI with injectable medicines (gonadotropins) raises the risk of twins and higher-order multiples. That's why ASRM guidance generally favors oral medicines for IUI in unexplained infertility.
What an IVF cycle is like
IVF uses injectable hormones to grow several eggs at once. Expect roughly 8 to 14 days of injections you give yourself at home, with monitoring visits every day or two near the end. The eggs are retrieved with a needle under sedation (you'll need someone to take you home), fertilized in the lab (sometimes by ICSI, where one sperm is injected into each egg), and grown for several days. One embryo is usually transferred, and extra good-quality embryos can be frozen. Embryos can also be genetically tested before transfer. Our IVF process step by step guide has the full timeline.
Who is IUI a good fit for?
IUI is often a reasonable first step for:
- Unexplained infertility, especially in younger patients
- Ovulation problems, such as PCOS, combined with ovulation medicine
- Mild male factor, where sperm count or movement is slightly low
- Single people and same-sex couples using donor sperm, who may not have an infertility diagnosis
- Cervical factors or problems with intercourse
IUI needs at least one open fallopian tube, so most patients have a tube test first, often an HSG (an X-ray with dye; expect strong cramping for a few minutes).
Who should consider IVF first?
IVF is usually recommended first, or after fewer IUI attempts, for:
- Blocked or damaged fallopian tubes, or a past tubal ligation
- Severe male factor, such as very low count or movement
- Older age, often 38 to 40 and above, where time is limited
- Low ovarian reserve
- Moderate to severe endometriosis
- Genetic conditions where embryo testing (PGT) is wanted
- Several failed IUI cycles
- Plans for more than one child, where freezing extra embryos can help
How many IUI cycles before IVF?
For unexplained infertility, ASRM's guideline supports ovarian stimulation with oral medicine plus IUI, and notes that most IUI pregnancies happen in the first few attempts. Many clinics suggest about three or four IUI cycles before moving on, but it's individualized. If you're 38 or older or have low ovarian reserve, your doctor may suggest fewer IUIs or going straight to IVF. More on this in unexplained infertility treatment.
Risks and side effects compared
IUI
- Multiple pregnancy, especially with injectable medicines
- Mild cramping or spotting after insemination
- Infection, which is rare
IVF
- Ovarian hyperstimulation syndrome (OHSS)
- Egg retrieval risks such as bleeding or infection, which are uncommon
- Multiple pregnancy if more than one embryo is transferred
- More time, injections and cost
Both come with the emotional grind of waiting and possible negative results. Many people say the two-week wait is harder than any procedure. Ask your clinic about counseling support; most have it.
What does insurance cover in New York?
New York requires comprehensive insured individual, small-group and large-group plans to cover diagnosis and basic treatment of infertility, including IUI. Since January 1, 2020, insured large-group plans (more than 100 employees) must also cover three IVF cycles. Some insurers ask whether IUI is appropriate before approving IVF, but they must base that on medical necessity. Self-funded employer plans, Medicaid and the Essential Plan follow different rules. Our New York IVF insurance guide has the details.
A practical tip: call your plan before your first consult and ask, "Is my plan fully insured or self-funded, and is it a large-group plan?" That one answer tells you most of what you need to know.
Can IUI be done with donor sperm?
Yes. IUI is the most common way to use frozen donor sperm, and often the first step for single people and same-sex couples. Frozen sperm is thawed and prepared by the lab right before insemination. Because donor vials are expensive, careful ovulation timing matters, and some people later move to IVF to make the most of each vial.
Questions to ask your fertility doctor
- Based on my tests, what are my chances with IUI versus IVF?
- How many IUI cycles do you recommend in my case before IVF?
- Which medicines would I use, and what's my risk of twins?
- What will each option cost me after insurance?
- Are my tubes open, and has my partner's semen been tested?
- How early are monitoring appointments, and can I do any of them at a satellite office closer to home?
When to see a doctor
See a fertility specialist if you're under 35 and have tried for a year, 35 or older and have tried for six months, or 40 or older. Go sooner if you have irregular periods, known tube or sperm problems, or two or more miscarriages. A reproductive endocrinologist can help you choose between IUI and IVF based on your results. Browse fertility specialists in Manhattan or Nassau County.
Frequently asked questions
What is the main difference between IUI and IVF?
In IUI, washed sperm is placed directly into the uterus around ovulation and fertilization happens inside the body. In IVF, eggs are retrieved from the ovaries, fertilized in a lab, and an embryo is placed in the uterus.
How many IUI cycles should you try before IVF?
For unexplained infertility, ASRM guidance supports a limited number of IUI cycles with oral ovulation medicine, often around three or four, before moving to IVF. The right number depends on your age, test results and preferences.
Is IUI covered by insurance in New York?
New York requires comprehensive insured individual, small-group and large-group plans to cover basic infertility treatment, including IUI. Self-funded employer plans follow their own rules.
Can you skip IUI and go straight to IVF?
Yes, in many situations. IVF is usually recommended first for blocked fallopian tubes, severe sperm problems, and often for people with low ovarian reserve or older age, where time matters.
Sources
- ASRM — Evidence-based treatments for couples with unexplained infertility: a guideline
- ASRM — Intrauterine Insemination (IUI) patient fact sheet
- ASRM — In Vitro Fertilization (IVF) patient fact sheet
- ACOG — Treating Infertility FAQ
- NY DFS — Infertility Coverage Consumer FAQ
This article is for general education and is not medical advice. It does not replace an evaluation by a licensed clinician who knows your history. If you think you have a medical emergency, call 911.