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IVM (In Vitro Maturation of Oocytes)


What is in vitro maturation (IVM) and how does it work?

What is IVM?

In the IVM process, eggs are removed from your ovaries when they are still immature. They are then matured in the laboratory before being fertilised. The difference between IVM and conventional in vitro fertilisation (IVF) is that the eggs are immature when they are collected. This means that the woman does not need to take as many drugs before the eggs can be collected as she might if using conventional IVF, when mature eggs are collected.
In vitro fertilisation (IVF)

Is IVM for me?

Your clinic may recommend IVM:
if you are susceptible to developing OHSS (ovarian hyper-stimulation syndrome - a potentially dangerous over-reaction to fertility drugs), for example, if you have PCOS (polycystic ovarian syndrome)
where the cause of a couple’s infertility has been identified as being male factor only.

How does IVM work?

The procedure for IVM is as follows:
Step 1. As in conventional IVF, eggs are collected, but at an earlier stage, when they are immature. This means that you do not need to take as many ovary-stimulating hormones before your eggs are collected.
Step 2. The eggs are matured in a dish placed in an incubator in the laboratory for one to two days.
Step 3. When the eggs are mature, they are fertilised with your partner’s sperm. Embryos are cultured then transferred to your womb, just as they would be with conventional IVF treatment.
In vitro fertilisation (IVF)

What is my chance of having a baby with IVM?

The chances of a successful pregnancy with IVM are similar to those with conventional IVF, with the following additional risks:
because the eggs are immature when they are collected, it is likely that fewer eggs will be collected than in a conventional IVF cycle
there is also a risk that not all the eggs will mature sufficiently to be fertilised with your partner’s sperm.