Chickenpox patients are clinically tested for blood tests, which mainly look at indicators such as routine blood count, C-reactive protein, and liver function. These indicators are not used to confirm the diagnosis of chickenpox, but only to determine the general condition of the body. For example, the white blood cell count in the routine blood test is usually maintained in the normal range or slightly lower. If the white blood cell count is significantly elevated, it may indicate a co-infection with bacteria. If a patient with chickenpox has a decrease in platelets, it would suggest that the chickenpox may be severe, because in most mild cases of chickenpox, platelets are not significantly depleted and do not decrease significantly. c-reactive protein is also an indicator to determine the systemic inflammatory response, and if the disease is getting better, the dynamic trend of c-reactive protein should be gradually decreasing. It is possible that varicella patients may have complications of inflammation of the liver, when transaminases in liver function can be elevated, if transaminases are not elevated, it means there is no edematous hepatitis. The rest of the tests that can detect specific varicella antibodies or pathogens are relatively rare in clinical practice.