Ovulation Induction Treatment
Ovulation Induction Treatment
Ovulation plays a central role in natural conception, as pregnancy can only occur when the ovaries release a mature egg during the menstrual cycle. If ovulation does not happen regularly, or stops altogether, it can make it much harder to conceive.
What is Ovulation Induction?
Ovulation induction is a fertility treatment designed to help people who are not ovulating regularly, or who are not ovulating at all. This condition, known as anovulation, means the ovaries do not release an egg during the menstrual cycle, making natural conception difficult.
Ovulation induction works by using medication to stimulate the ovaries and encourage the development and release of a mature egg. By triggering ovulation, the treatment helps restore a more predictable cycle, and creates an opportunity for fertilisation to occur.
Who is best suited for treatment?
Ovulation induction is recommended for women who have not yet reached menopause but are not ovulating regularly.
This treatment is commonly used for women with polycystic ovary syndrome (PCOS), one of the most common causes of anovulation. However, it may also be suitable for women whose ovulation is affected by other hormonal or medical conditions, including:
- Hypothalamic amenorrhoea, where hormone signals from the brain disrupt ovulation, sometimes linked to stress, low body weight, or intense exercise.
- High prolactin levels (hyperprolactinaemia), which can interfere with the hormones that regulate ovulation.
- Other hormonal imbalances that prevent the ovaries from releasing an egg regularly.
- Ovulation Induction is also recommended for women who have not yet reached menopause but who are not ovulating regularly.
Before recommending ovulation induction, a fertility specialist will discuss having a fallopian tube patency test, a HyCoSy, to ensure that there are no physical obstructions preventing the egg and sperm meeting. The specialist may also assess hormone levels and review menstrual history to confirm whether ovulation is occurring, and whether the treatment is appropriate. Find out more about what might happen at your first appointment.
Ovulation Induction Medications
Ovulation induction usually involves medications that stimulate the ovaries to develop and release an egg. Common medications used for ovulation induction include:
- Clomiphene citrate (Clomid) – a widely used medication that stimulates the hormones responsible for ovulation, encouraging the ovaries to release an egg.
- Letrozole – an aromatase inhibitor that can help trigger ovulation by influencing hormone levels that control the menstrual cycle.
- Metformin – sometimes prescribed for women with PCOS to help improve insulin resistance, which can support more regular ovulation.
A fertility specialist will determine which medication is most suitable based on hormone levels, underlying conditions, and previous treatment history. At Concept Fertility, medication is only used where clinically appropriate, with a focus on using the lowest effective drug regimen.
The Ovulation Induction Cycle: Step-by-Step
Ovulation induction is carefully monitored to help ensure the ovaries respond safely and effectively to treatment. The process usually follows a series of steps throughout the menstrual cycle.
1. Initial monitoring
The cycle typically begins with an ultrasound scan to assess the ovaries and check whether a follicle (which contains the egg) is developing.
2. Medication, if needed
Based on the scan results, your specialist may recommend ovulation induction medication, such as tablets or injections, to encourage the ovaries to develop a mature egg.
3. Tracking follicle development
Further ultrasound monitoring may be carried out to track the growth of the follicle and confirm when the egg is ready for release. It is also crucial to ensure that too many follicles are not developing as these could lead to a multiple pregnancy with a risk of miscarriage and other health problems.
4. Triggering ovulation
Ovulation may occur naturally, but it is more common to give an injection to mature the egg and trigger ovulation at the optimal time.
5. Timed conception
Once ovulation is expected, patients can try to conceive through timed intercourse (or in some cases IUI) during the most fertile window.
This structured approach helps ensure ovulation occurs at the right time, improving the chances of pregnancy with minimal medical intervention.
Explore the Fertility Treatment Process
Encouraging Follicle Dominance and Development
Ovulation induction medications support ovarian follicle dominance, the process where one follicle becomes the “leading” follicle and develops into a mature egg. While several follicles may begin to grow early in the cycle, usually only one continues to develop and reaches ovulation.
Medications help regulate the hormones involved in this process, particularly follicle-stimulating hormone (FSH), which supports follicle growth, and luteinising hormone (LH), which helps trigger ovulation. By influencing these hormones, treatment encourages a healthy follicle to mature and release an egg.
Side Effects and Risks: Understanding OHSS
At Concept Fertility, we always provide a full range of options based on your causes of infertility, your health, and the likelihood of getting pregnant with each treatment. Your doctor will explain the risks of each treatment to ensure that you begin the procedures fully informed.
Ovulation induction is not invasive, and regular monitoring with ultrasound and hormone measurements ensures that we can watch out for any signs of ovarian hyperstimulation syndrome (OHSS), aiming to ensure that only one or two follicles are developing. As women with PCOS are often sensitive to fertility drugs, more than one egg may be produced, which leads to twins or triplets. This only occurs in 5-10% of cases.
Prolonged use of the medicines involved in inducing ovulation can have a negative effect on the lining of the uterus, so we check that during our monitoring processes too. If we do notice any damage, we offer alternative medication to continue with the treatment without further risks to your health.
Ovulation Induction Success Rates
The success of ovulation induction can vary depending on several factors, including age, overall reproductive health, and the underlying cause of infertility. On average, the chance of pregnancy with ovulation induction is around 10–20% per cycle.
For women whose primary fertility challenge is anovulation, outcomes are often more positive. Studies suggest that up to 80% of patients begin ovulating once treatment is introduced, and around 50% of those who successfully ovulate may go on to conceive over the course of treatment.
It is important to remember that success rates differ from person to person. Factors such as age, egg quality, and the presence of any additional fertility issues can influence the likelihood of pregnancy.
Ovulation Induction vs. IUI
Ovulation induction is often used as a first-line treatment for patients with ovulatory disorders such as anovulation. The aim is to stimulate the ovaries to release an egg, so conception can occur through timed intercourse during the fertile window.
Intrauterine insemination (IUI) may be recommended if ovulation induction alone does not lead to pregnancy, or if other fertility factors are present. IUI involves placing prepared sperm directly into the uterus at the time of ovulation, to increase the chances of fertilisation.
A patient may move from ovulation induction to IUI if ovulation has been successfully triggered but pregnancy has not occurred after several cycles, or if there are additional factors such as mild male infertility or unexplained fertility issues. In some cases, ovulation induction medication may also be used alongside IUI to improve the chances of success.
Frequently Asked Questions
How many cycles of ovulation induction are usually recommended?
Many patients try ovulation induction for three to six treatment cycles. The exact number can vary depending on factors such as age, how the body responds to medication, and whether ovulation is successfully triggered. Your fertility specialist will monitor each cycle and review progress before recommending whether to continue treatment.
What if ovulation induction doesn’t work?
If pregnancy does not occur after several cycles, your specialist may suggest adjusting the medication, exploring the underlying cause of infertility further, or moving to another treatment such as intrauterine insemination (IUI). A consultation with a fertility specialist can help determine the most appropriate next step based on your individual circumstances.
