WHO identitier version 2 Target audience laboratory professionals and users of IDs. Purpose of this notice clarify information previously provided by WHO. This notice supersedes WHO. Information Notice for In Vitro Diagnostic Medical Device IVD Users version 1, issued 14 December 2020. Description of the problem WHO requests users to follow the instructions for use IFU when interpreting results for specimens tested using PCR methodology. Users of IVDs must read and follow the IFU carefully to determine if manual adjustment of the PCR positivity threshold is recommended by the manufacturer WHO guidance Diagnostic testing for SARS CoV 2 states that careful interpretation of weak positive results is needed 1 . The cycle threshold Ct needed to detect virus is inversely proportional to the pati



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