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Highly sensitive qualitative and quantitative automatednucleic acid amplification tests (NATs) that are commercially available for the detection of hepatitis B virus (HBV)infection have been developed only in the last few years.The potential indications for HBV NATs are: follow-up ofchronic hepatitis B, therapy and antiviral resistance monitoring, determination of infectivity and transmission risk,detection of occult (HBsAg-negative and HBV DNA-positive) infection and mutant virus which may escape serologic diagnosis, blood donor screening, and resolution ofunusual or discordant serologic constellations. Although NATs are now widely implemented in the routine diagnosis of clinical laboratories, there are several importantissues which need to be further investigated. Standardisation of NATs used for the monitoring of antiviral therapyand follow-up of chronic infection is still lacking, and theclinical significance of HBV DNA levels needs to be clarified. The influence of genetic variability in terms of genotype variation has been poorly investigated so far.Although there are highly sensitive automated NATs forblood donor screening available, their implementation is still subject to discussion and certain countries rejectedHBV DNA testing for blood donation for reasons of poor cost-effectiveness.