How accurate is an endometrial biopsy if you had one last year w/a hysteroscopy which was normal and a office biopsy last week same results?

Very: I assume that the biopsy was done for symptoms or as f/u for the prior biopsy and/or surveillance. If the findings were normal and the report agrees with your doctor's impression, then it's very accurate.

Over 90%: A blind endometrial biopsy may sample as little as 4% of the lining but can be 90% accurate the hysteroscopy adds more clarification and it's biopsy can be more accurate.

Hysteroscopy: If you are having it done to rule out hyperplasia, then its a pretty good test - not perfect. However if bleeding were to be abnormal, you'll still get a better sample in the or with hysteroscopy , directed biopsy, and d and c.