If a patient with pneumonia has a normal blood picture, there are usually several factors as follows: 1, for example, if the patient’s immunity is relatively low and resistance is relatively poor, the blood picture will have no obvious specific changes. 2, for example, mycoplasma or chlamydia and other atypical pathogens infected with pneumonia occurs, the patient will also appear normal blood picture. 3.If the patient suffers from pneumonia for a relatively long time, if in 5 days, or even more than 7 days, after the application of certain antibiotics or antiviral drugs for treatment, then the examination of the patient’s blood picture will also be normal. Therefore, if the patient wants to confirm the diagnosis of pneumonia, it can not be judged by the blood test alone, but should also be combined with the C-reactive protein or calcitoninogen and other tests to determine the diagnosis.