The nucleic acid test for neo-coronavirus can be done through blood tests. Currently, the following specimens are available for nucleic acid detection of neo-coronavirus: nasal swabs, sputum and lower respiratory secretions, blood can also be tested, and stool and other specimens can be tested for nucleic acid of neo-coronavirus. Indirect tests can also be performed by blood sampling, such as normal or decreased total leukocyte count and decreased lymphocyte count in early peripheral blood, some patients may have elevated liver enzymes and cardiac enzymes, elevated troponin can be detected in critically ill patients, most patients have slightly increased sedimentation and C-reactive protein, but normal calcitoninogen, or in severe cases, D-dimer. In severe cases, D-dimer may be elevated, peripheral lymphocytes are progressively reduced, and inflammatory factors are often elevated in critically ill patients.