<<Disclaimer: Verify this information before applying it to your situation.>> I have received 14 responses to my query. I thank you all. The concensus is: not rely on tests, they are often errroneous. If she was feeling good GF, Why not stay GF. One said the Dr. should have done the biopsy in the beginning. A few said the negative results are quite often erroneous, but not the other way around. Many thanks again, Mireille.