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.
On the day between the trigger injection and egg collection you will not be required to inject any drugs.
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.