Biopsy for gallstones?

By your explanation, I'm not sure WHERE the biopsy was done. If it was down her esophagus, throat or stomach area, he may have seen something suspicious with the camera. Taking a small piece of the area of concern can be studied to check out any type of disease or even testing for cancer. He may just be making sure that what he saw isn't a problem. Better to be safe than sorry. But, tell your friend not worry about this precedure. Most likely it is nothing. The only way to find out for sure is for her to ask the doctor that performed it. Hope all is well.