Antral follicle - Why day 2-5 of cycle?

I'm 42 and have been advised that the antral follical scan needs to be done during days 2-5 of my cycle, however I've read it can be any day of the cycle and also days 5-12. I'm confused. Are there different reasons for a first scan pre IVF to be done on certain days of your cycle?

Our Expert's Answer

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An antral follicle scan can be done at any time in the cycle. There isn’t any reason that the first scan is done on certain days as anytime is appropriate, although it is quite good just after your period.