Day 1 - Fertilisation check

Day 1 - fertilisation check

The first day

On the first day we need to find out how many of your eggs have fertilized. No matter how we fertilised the eggs yesterday with IVF, ICSI or IMSI, the procedure for fertilisation check is pretty much the same. It takes place around 18 hours after we inseminate your egg or inject the sperm.

We all hope that things have gone well overnight, but we won’t know until we look closely at your eggs. We are looking for signs of ‘normal’ fertilisation and it’s easy to spot this using the microscopes we have in the laboratory.

A normally fertilised egg should have two ‘pronuclei’ (the male and female genetic information which you can see as two small circles within the egg). If an egg has fertilized normally these are very clear to see.  If an egg is seen to have more or less than two pronuclei then this has fertilised abnormally and is separated from the normally fertilised eggs.

It may sound silly but it’s perfectly normal for some of your eggs to fertilize abnormally, its nothing at all to worry about.

We’ll call you on the morning of the Fertilisation Check, usually before 10:00 to let you know how things have gone. We probably don’t need to say this, but it’s important that you keep close to the telephone, as we know you will want to find out as soon as possible how your eggs have fertilized.