New coronavirus can be detected by blood testing. Currently, new coronavirus is detected mainly by fluorescence RT-PCR, which can be collected from blood specimens for real-time testing, and positive nucleic acid of new coronavirus can confirm the diagnosis. The diagnosis can also be confirmed by collecting blood specimens for viral gene sequencing, if they are highly homologous with known novel coronaviruses. General blood tests can be used as an adjunctive diagnostic test for novel coronavirus infection, which is often manifested by a normal or decreased peripheral blood leukocyte count, often a decrease in absolute lymphocyte values, and in some cases a decrease in platelets.