When ready to proceed with an egg collection, a ‘trigger’ injection is given. The timing of this is very specific so that the eggs are collected at the correct time. The trigger injection is given 35-37 hours before the eggs are collected and is always given in the evening. There are two types of trigger injection: Ovitrelle and Pregnyl. There is no difference in the effects of the drugs, they are just made by different drug companies.
You will be asked to attend the CRM London clinic 30 minutes before the time of your egg collection so that you can be prepared for the egg collection procedure. You should have no food or drink from midnight the night prior to the egg collection.
The egg collection is performed under intravenous sedation and you will be asleep. It is not a general anaesthetic as this is not required. The procedure takes approximately 25 minutes from start to finish.
You will need someone to take you home.
Your partner will be asked to produce a sperm sample on the day for fertilisation of the eggs. You should refrain from intercourse 72 hours prior to the day of egg collection to maximise the quality of the sperm. It is, however, important to have ejaculated 72 hours prior to the egg collection as a prolonged abstinence can also decrease the quality of the sperm.