Choosing between IUI and IVF can feel overwhelming. Both are proven fertility treatments, but they work in different ways and suit different situations. So how do you know which treatment is best for you?
At Ferticentro, our team helps you understand which treatment gives you the best chance based on your specific situation. Your age, diagnosis, and personal circumstances all matter.
Here’s everything you need to know about IUI and IVF.
Intrauterine insemination (IUI) is often the first step in fertility treatment. It’s a relatively straightforward procedure where specially prepared sperm is placed directly into your uterus around the time of ovulation.
The process usually involves taking hormonal medication to help one or two eggs develop properly in your ovaries. These eggs grow inside fluid-filled sacs called follicles. Your doctor monitors the follicles with ultrasound scans until they reach the right size. When they’re ready, you take a trigger medication that causes ovulation, and the IUI procedure happens about 36 hours later.
The actual insemination takes just a few minutes. Using a thin, flexible catheter, the doctor carefully introduces the prepared sperm into your uterus. The procedure is painless and doesn’t need sedation or anaesthesia.
Dr. Vladimiro Silva, Scientific Director at Ferticentro, explains:
“IUI works with your body’s natural process. We’re simply giving the sperm a head start by placing it closer to where it needs to be. For the right candidates, it’s an effective and less invasive first option.”
IUI is typically recommended for:
Mild male factor infertility.
If sperm parameters are slightly below reference values, the sperm don’t move as well as they should, or their shape isn’t quite right, IUI can work well. The lab preparation process selects the strongest, most active sperm. To learn more, read our guide on male infertility.
There are also ways to improve sperm quality naturally. Find out how from our guide on sperm quality.
Cervical issues
Sometimes the mucus in your cervix creates a barrier that makes it harder for sperm to get through. IUI bypasses this entirely by placing sperm directly into your uterus.
Ovulatory disorders
If your periods are irregular or you’re not ovulating consistently, IUI combined with medication to stimulate egg development can help you conceive.
Unexplained infertility
When all your tests come back normal but pregnancy still isn’t happening, IUI with mild stimulation can improve your chances.
Same-sex female couples, single women or heterosexual couples where the male partner is not capable of producing viable spermatozoa
IUI with donor sperm is often the starting point for building a family.
If your tubes are blocked, IUI won’t work because the sperm has no way to reach the egg. In these cases, IVF is the only option.
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In vitro fertilisation (IVF) is a treatment where fertilisation happens outside your body, in a laboratory.
Here is what the process usually looks like:
Ovarian stimulation
You take hormone medication to help several eggs mature in the same cycle.
Egg collection
When the eggs are ready, we collect them in a short procedure under sedation.
Fertilisation in the lab
We fertilise the eggs either by placing them with prepared sperm, or by using ICSI (intracytoplasmic sperm injection), where we inject a single sperm into each egg.
Embryo development and monitoring
The embryos develop in special incubators for several days. At Ferticentro, we monitor embryos 24/7 in the EmbryoScope, which allows us to assess their development without disturbing them.
Embryo transfer
We transfer one or two embryos into your uterus. If you have other viable embryos, we can freeze them for future use.
For more detailed information on IVF, you can read our Beginner’s Guide to IVF.
IVF can be the right option if you have:
Dr. Silva notes:
“IVF gives us much more control over the process. We can see fertilisation happen, monitor embryo development closely, and select the embryos with the best potential. For many patients, especially those with more complex fertility challenges, it’s the most direct route to pregnancy.”
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IUI is simpler. You usually take medication to support one or two follicles, come in for ultrasound monitoring, then have a quick insemination procedure. You do not need sedation, and you do not have an egg collection.
IVF involves more steps. You take stronger stimulation medication, come in more often for monitoring, have egg collection under sedation, and then we fertilise and grow embryos in the lab before transfer.
IUI cycles are shorter. From the start of stimulation to a pregnancy test, it often takes around 3 weeks. If it does not work, you can often try again next month.
IVF cycles take longer. From starting medication to the pregnancy test is roughly 4-5 weeks. If you’re doing a freeze all cycle (where we freeze any suitable embryos after egg collection and transfer one in a later cycle instead of doing a fresh transfer straight away), there’s even more time between retrieval and transfer.
IUI costs less than IVF. Because there is less lab work involved, IUI usually costs less IVF, which makes it a sensible first option when it fits your situation.
IVF costs more because it includes medication, monitoring, sedation, laboratory fertilisation, embryo culture, and transfer. However, many international patients choose Portugal for fertility treatment because IVF costs are a lot lower than in the UK or the US.
At Ferticentro, we keep pricing transparent, so you know what you pay from the start. We also integrate technologies (like the Embryoscope and RI Witness System) without additional cost.
IUI tends to feel lighter. Medication is usually milder, monitoring is less intensive, and most people continue normal routines.
IVF asks more of you. Stronger medication can cause bloating, mood changes, and discomfort. Egg collection is quick, but you will need sedation and a short recovery. Many people also feel more emotional pressure or anxiety because IVF involves more steps and a bigger financial commitment.
For same-sex female couples, single women, or heterosexual couples dealing with severe male infertility, IUI with donor sperm (IUI-D) opens up possibilities.
The process is similar to standard IUI, but frozen donor sperm is used instead. At Ferticentro, you can choose from Portugal’s largest open-ID sperm bank, with detailed donor profiles including physical characteristics, education, and personality traits.
One important technical note: Not all frozen sperm samples work for IUI. You need samples with a post-thaw motility count of MOT20 or higher. If you’re ordering sperm from external banks (which is also possible), your patient coordinator will make sure you order the right type of sample for your treatment.
IUI-D can be done with mild stimulation or in a natural cycle (without medication), depending on your situation. Natural cycle IUI-D works well for women with regular ovulation who simply need donor sperm.
Age plays a big role in fertility treatment success.
“At this age, egg quality and quantity can decline more quickly. IVF can give you the best chance of success without losing time on treatments that may be less effective. It also allows us to genetically test the embryos, making sure that we transfer the ones with a normal genetic constitution and therefore much higher chances of implantation”.
What we see in your tests helps guide the best starting point.
This is not just medical, it is emotional too.
Some people want to start with the least invasive option and build up. Others prefer to choose the treatment with the highest success rate from the beginning.
Both approaches make sense. There is no single right answer. The right option is the one that fits your situation and feels better for you.
Cost matters, and it is worth looking at the full picture.
IUI costs less per cycle, which can make it a sensible starting point. But if you do several IUI cycles without success, the total cost can start to add up, especially if you’re using donor sperm from external banks. In some situations, choosing IVF earlier can be the more cost effective option because it gives a higher chance of success per cycle.
Whether you choose IUI or IVF, certain factors affect your chances:
Egg quality matters hugely for both treatments. This is mainly influenced by age but also by factors like ovarian reserve and overall health.
Sperm quality affects both IUI and IVF, though IVF with ICSI can overcome way more sperm issues than IUI can.
Uterine health is important for implantation in both treatments. Any issues with the uterine lining or structural problems need addressing.
Lifestyle factors like smoking, excessive alcohol, stress, and weight all influence success rates for both IUI and IVF, though their impact is often smaller than people think.
As you think about IUI versus IVF, ask yourself these questions:
IUI and IVF aren’t competing treatments, they’re tools for different situations.
IUI works best when your fertility issues are relatively mild, your tubes are open, you’re under 35, and you have time to try a less invasive approach first.
IVF is the better choice when you have tubal problems, significant male factor infertility, advanced maternal age, or when you’ve already tried IUI without success.
For some people, the choice is clear from the start. For others, it’s less obvious, and starting with IUI while keeping IVF as a next step makes sense.
What matters most is that your treatment matches your specific situation, your timeline, and your personal preferences. At Ferticentro, the team takes time to understand all these factors before recommending a path forward.
Dr. Silva emphasizes:
“There’s no one-size-fits-all answer. The right treatment is the one that gives you the best realistic chance of pregnancy while fitting your circumstances and preferences. That’s different for everyone.”
Contact Ferticentro to book your initial consultation and get personalised advice on whether IUI or IVF is right for you.
