Natural Cycle IVF
What is natural cycle IVF
Natural cycle in vitro fertilization is a form of IVF performed without ovarian stimulation medication. Instead of stimulating the ovaries to produce multiple eggs, it uses the egg that naturally matures during the woman’s cycle.
With this method, the naturally selected egg of the cycle is retrieved and fertilized in the laboratory, as in conventional IVF. The resulting embryo is then transferred to the uterus or cryopreserved until a satisfactory number of embryos is available for transfer (Embryo Banking).
Natural cycle IVF is considered a more gentle approach to in vitro fertilization, as it avoids the extensive use of medications commonly used in standard ovarian stimulation protocols.
How natural cycle IVF is performed
In natural cycle IVF, the woman’s natural menstrual cycle is monitored with ultrasound scans in order to track follicular development.
When the follicle reaches the appropriate stage of maturation, egg retrieval is performed. The egg is then fertilized in the laboratory, and the embryo that develops is transferred to the uterus.
In some cases, small amounts of medication may be given, such as GnRH antagonists to prevent premature ovulation or hCG to help time egg retrieval appropriately.
When is it recommended
Natural cycle IVF may be recommended for women who:
- wish to avoid ovarian stimulation medication
- have low ovarian reserve
- do not respond adequately to stimulation protocols
- are at increased risk of ovarian hyperstimulation syndrome
- have a history of hormone-dependent conditions
The Process
The natural cycle IVF process, step by step.
Monitoring the natural cycle
Ultrasound is used to monitor the normal development of the follicle during the menstrual cycle.
Egg retrieval and fertilization
Once the follicle has matured sufficiently, the egg is retrieved and fertilized in the laboratory.
Embryo transfer
The embryo that is created is transferred to the uterus with the aim of achieving pregnancy.
Natural cycle IVF at 45
In some cases, natural cycle IVF may also be considered for women of advanced reproductive age, such as around 45 years old, particularly when ovarian reserve is limited or when there is a poor response to intensive ovarian stimulation protocols.
In these cases, the approach is based on using the egg that matures naturally during the woman’s cycle, without extensive stimulation medication. This method may offer a gentler treatment option for women who wish to try using their own eggs.
However, the chances of successful IVF decrease with age, which is why treatment choice should always be made after an individualized evaluation.
Advantages of natural cycle IVF
Natural cycle IVF offers several important advantages:
- intensive ovarian stimulation is avoided
- the risk of ovarian hyperstimulation syndrome (OHSS) is reduced
- there are fewer side effects from medication
- the treatment is gentler on the body
- treatment costs are lower compared with conventional IVF
In addition, because a single embryo is usually transferred, the likelihood of a multiple pregnancy is significantly reduced.
Modified natural cycle IVF
A variation of this method is modified natural cycle IVF. In this approach, small doses of medication are used for a limited period to support the development of more eggs, usually 2 to 7.
This approach combines the benefits of a mild treatment with a greater chance of retrieving more eggs compared with a purely natural cycle.
Frequently Asked Questions (FAQ)
In a natural cycle, one egg is usually retrieved, as the follicle that develops naturally during the woman’s cycle is used. In some cases, there may be more than one follicle, but this is not the norm.
This method is not suitable for all infertility cases. The choice of treatment depends on the woman’s age, ovarian reserve, and overall fertility history. For this reason, the decision is always made after an individualized medical evaluation.
Yes, treatment can be repeated in consecutive cycles, as intensive ovarian stimulation medication is not used. In some cases, this allows more attempts to be made within a shorter period of time.
Side effects are usually fewer compared with intensive ovarian stimulation protocols. This is because high doses of fertility medications are not used.
The treatment cycle follows the normal duration of the woman’s menstrual cycle. Monitoring begins in the first days of the cycle and is completed with egg retrieval and embryo transfer.
The cost of natural cycle IVF may vary depending on the assisted reproduction center, the treatment protocol, and any additional tests or procedures that may be required. In general, treatment may be more affordable than conventional IVF, as fewer ovarian stimulation medications are used.
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