Intrauterine insemination (IUI) is a fertility treatment designed to help sperm reach the egg more easily around the time of ovulation. During the procedure, a specially prepared sample of sperm is placed directly into the uterus using a thin, flexible catheter. The sperm may come from a partner or from a donor, depending on the individual circumstances.
IUI is a relatively simple and minimally invasive form of assisted reproduction and may be performed during a natural menstrual cycle or in combination with medication to stimulate ovulation. Unlike in vitro fertilisation (IVF), fertilisation does not take place in a laboratory. Instead, the sperm and egg meet naturally inside the woman’s reproductive system.
Whether IUI is an appropriate fertility treatment depends on several factors, including the cause of infertility, the woman’s age, the condition of the fallopian tubes and the quality of the sperm.
What Is Intrauterine Insemination (IUI)?
Intrauterine insemination (IUI), also known as artificial insemination, is a fertility treatment in which a prepared sample of sperm is placed directly into the uterus around the time of ovulation.
Before the insemination, the semen sample is processed in the laboratory to separate and concentrate the motile sperm. The prepared sperm is then introduced into the uterus through a thin, flexible catheter that passes through the cervix.
The aim of IUI is to bring a higher concentration of suitable sperm closer to the egg, reducing the distance they need to travel through the reproductive tract. Unlike IVF, the eggs are not removed from the ovaries and fertilisation does not take place in a laboratory. Instead, fertilisation occurs naturally inside the woman’s body after insemination.
Who Is IUI Suitable For?
Intrauterine insemination may be recommended for selected individuals and couples depending on the cause of infertility and the results of their fertility assessment. It is commonly considered in cases involving:
- unexplained infertility in appropriately selected couples,
- certain cases of mild male-factor infertility,
- difficulties with vaginal intercourse or ejaculation,
- the use of donor sperm,
- single women who wish to conceive with donor sperm,
- female same-sex couples using donor sperm.
Before recommending IUI, the doctor evaluates factors such as the woman’s age, ovulation, ovarian reserve, the condition and patency of the fallopian tubes, and sperm quality.
IUI may not be the most appropriate treatment when there are blocked or severely damaged fallopian tubes, significant male-factor infertility, severe endometriosis or other fertility factors that substantially reduce the likelihood of success. In these circumstances, IVF or another assisted reproduction technique may be considered instead.
How Is IUI Performed?
The IUI procedure is carefully timed around ovulation to increase the chance that sperm and egg will meet. Depending on the woman’s fertility profile, treatment may take place during a natural menstrual cycle or with medication to stimulate ovulation.
Before the IUI Procedure
Before treatment begins, a fertility assessment is performed to confirm that IUI is an appropriate option. This may include an ultrasound examination, assessment of ovulation and tests to check that the fallopian tubes are open. When a partner’s sperm is used, a semen analysis is also usually required.
During a natural cycle, ovulation is monitored so that insemination can be timed appropriately. In a stimulated cycle, fertility medication may be used to encourage follicle development, with ultrasound monitoring to assess the ovarian response.
Sperm Preparation and Insemination
On the day of the procedure, a semen sample is collected or previously prepared donor sperm is used. The sample undergoes laboratory preparation, commonly referred to as sperm washing, to obtain a concentrated sample of suitable motile sperm.
During insemination, a speculum is gently inserted into the vagina and a thin, flexible catheter is passed through the cervix into the uterus. The prepared sperm is then introduced directly into the uterine cavity.
The procedure itself usually takes only a few minutes and does not normally require anaesthesia.
After IUI
IUI is generally well tolerated. Some women may experience mild cramping or light spotting shortly after the procedure, but most can return to their usual daily activities soon afterwards.
A pregnancy test is usually performed approximately two weeks after insemination, according to the instructions provided by the fertility specialist.
IUI is considered a low-risk procedure. When fertility medication is used to stimulate the ovaries, however, careful monitoring is important because ovarian stimulation can increase the risk of multiple pregnancy and, less commonly, ovarian hyperstimulation.
IUI Success Rates
The success of intrauterine insemination varies from person to person and cannot be predicted by a single percentage. Several factors influence the likelihood of pregnancy, including the woman’s age, ovarian reserve, the cause and duration of infertility, sperm quality and the condition of the fallopian tubes.
Age is particularly important, as fertility gradually declines with increasing maternal age. The chances of success may also differ depending on whether IUI is performed during a natural cycle or in combination with ovarian stimulation.
For this reason, IUI success rates should always be discussed individually after a complete fertility assessment rather than considered as a fixed figure.
How Many IUI Cycles Should You Try?
The appropriate number of IUI attempts depends on the individual fertility profile. In couples with unexplained infertility, a limited course of approximately three to four stimulated IUI cycles with oral fertility medication may be considered before moving on to IVF.
For women of more advanced reproductive age, or when other fertility factors are present, the doctor may recommend proceeding to IVF sooner in order to avoid losing valuable time.
IUI vs IVF
Intrauterine insemination (IUI) and in vitro fertilisation (IVF) are both assisted reproduction treatments, but they differ significantly in how fertilisation takes place.
With IUI, prepared sperm is placed directly into the uterus and fertilisation occurs naturally within the woman’s body. In IVF, eggs are collected from the ovaries and fertilised with sperm in the laboratory before an embryo is transferred to the uterus.
IUI is generally a simpler and less invasive treatment and usually involves fewer medications than IVF. However, IVF offers greater control over the fertilisation process and generally has higher success rates per treatment cycle.
The most appropriate treatment depends on several factors, including the woman’s age, ovarian reserve, the condition of the fallopian tubes, sperm quality and the underlying cause of infertility.
IVF may be recommended instead of IUI when there are blocked fallopian tubes, significant male-factor infertility, severe endometriosis, reduced ovarian reserve or when previous IUI attempts have been unsuccessful. The decision should always be based on an individual fertility assessment.
Intrauterine Insemination With Dr Panagiotis Kaliantzis
Dr Panagiotis Kaliantzis MD, MRCOG, DFFP provides personalised fertility assessment and treatment for individuals and couples considering intrauterine insemination.
Before recommending IUI, each case is carefully evaluated based on factors such as age, ovulation, ovarian reserve, tubal patency, sperm quality and previous fertility history. This allows the treatment plan to be adapted to the individual needs of each patient and helps determine whether IUI, either in a natural or stimulated cycle, is an appropriate option.
Dr Kaliantzis provides fertility care at his practices in Athens and Tripoli, offering guidance throughout the evaluation, treatment and follow-up process.
Frequently Asked Questions About IUI
Is IUI painful?
IUI is generally not painful, although some women may experience mild discomfort during the insertion of the speculum or catheter. Mild cramping can also occur for a short time after the procedure.
How long does an IUI procedure take?
The insemination itself usually takes only a few minutes and does not normally require anaesthesia. After a short rest, most women can leave the clinic and return to their usual daily activities.
When can I take a pregnancy test after IUI?
Your fertility specialist will provide a specific date for the pregnancy test, which is commonly around two weeks after insemination. Testing too early may produce a misleading result, particularly when fertility medication has been used.
How many IUI attempts are recommended?
There is no single number of IUI cycles that is appropriate for everyone. The decision depends on age, fertility history, the reason for treatment and the response to previous cycles. After several unsuccessful attempts, the fertility specialist may reassess the treatment plan and discuss whether IVF would offer a more appropriate next step.
Can IUI be performed with donor sperm?
Yes. IUI can be performed using either a partner’s sperm or donor sperm. Donor sperm IUI is commonly used by single women and female same-sex couples, as well as in other circumstances where donor sperm is required to achieve pregnancy.
