Is endometrial biopsy necessary just because one has heavy menstruation? is a vaginal ultrasound an alternative and just as good?

If you are not comfortable with the opinion of your doctor, it is appropriate to seek evaluation by a different gynecologist. It is not feasible to provide a more meaningful opinion without examining you.

A vaginal ultrasound gives different information from an endometrial biopsy, and either, both, or neither may be appropriate depending on the particular circumstances.