rescyth, thanks for your reply. Now I understand more about false-positive test. In fact, the blood bank confirmed the test with RIBA and NAT using same collection. Both came back negative. Only the EIA shows reactive so far. My primary physician said she ordered 'DNA' test (?) to confirm it's negative too. Not sure what the blood bank used in the confirmation test before my last donation but it passed and they put me back to eligible-to-donate list.