Abstract
INTRODUCTION: The introduction of nucleic acid (NAT) assays for DNA / HBV detection in the routines of public blood banks is recent and there are still few studies in Brazil about them. These methods are highly sensitive and are able to identify donations in the immunological window period and Occult hepatitis B Infection (OBI). At Fundação Pró-Sangue / Hemocentro in São Paulo (FPS-SP), a…