Yes it is common to have biopsies taken of any tissue that may possibly be endo. Endo comes in so many shapes and sizes...and colours too. yellow and white and red.
Red endo is easy to see and remove. White and yellow sorts could just be fatty deposits or other tissue not endo, so for that reason, it is necessary to remove some suspect samples and send them to the lab to be checked as they may mean further work needs doing on that location at a later date.
How many biopsies done varies entirely on what is found when they get in you.
Could be one or two, or a dozen or more. Nothing to worry about. The results take a few weeks to come back and normally a letter is sent to you and your GP or just your GP with the results of the biopsies.
If you do have a follow up appointment with your surgeon then the results will be discussed with you then, if endo was identified but not removed. It is indeed a standard part of a diagnostic lap op. Not everyone will need biopsies taken, but if there is need then it will be done.
I don't know how many I had done - was just told several.
All okay except the one on the cervix - which was iffy.