Which pathogens are typically screened by donor testing and how is NAT used?

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Multiple Choice

Which pathogens are typically screened by donor testing and how is NAT used?

NAT focuses on the genetic material of viruses, not antibodies. By detecting viral nucleic acids (RNA or DNA) in donor samples, NAT can identify infections during the early phase when antibodies may not yet be present. This shortens the window period—the time after infection when serologic tests might be negative—and lowers the risk of transfusion-transmitted HIV, HBV, and HCV. In practice, NAT is used in donor screening in addition to serology to improve safety, making it the best choice among the options. The other statements misstate NAT’s function (it does not detect antibodies) and its role (it is indeed used for donor screening).

NAT focuses on the genetic material of viruses, not antibodies. By detecting viral nucleic acids (RNA or DNA) in donor samples, NAT can identify infections during the early phase when antibodies may not yet be present. This shortens the window period—the time after infection when serologic tests might be negative—and lowers the risk of transfusion-transmitted HIV, HBV, and HCV. In practice, NAT is used in donor screening in addition to serology to improve safety, making it the best choice among the options. The other statements misstate NAT’s function (it does not detect antibodies) and its role (it is indeed used for donor screening).

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