Patients with novel coronavirus pneumonia have their blood drawn after hospitalization for several purposes: 1. To understand the blood routine. The so-called blood routine, that is, changes in lymphocytes after viral infection, because lymphocytes are the body’s immune cells, which can produce many antibodies. For the new coronavirus pneumonia, the blood routine is characterized by a progressive decline in lymphocytes; 2, check the biochemistry, mainly to detect whether the new coronavirus pneumonia patients have changes in kidney function, liver function changes; check the cardiac enzymes to check whether there is damage to the myocardium; check the D-dimer, to see whether the coagulation image is a hypercoagulable state; 3, to clarify whether there is a new coronavirus infection, or through the nucleic acid detection The relevant tests should be performed by nucleic acid test kit to clarify whether there is a new coronavirus infection. In patients with severe disease, more items are required to be examined, for example, it is likely that blood gas changes will be monitored dynamically, because after lung infection, mainly the function of the lungs is significantly damaged, and the direct response is blood gas changes. The so-called blood gas changes are the blood oxygen situation, the blood carbon dioxide situation, the absence of metabolic acidosis, etc. The blood gas situation should be monitored dynamically. Content source: Dr. You Lai