It is not recommended to take blood for medical checkups for colds, as this will affect the judgment of the results of the medical checkup. When the human body has a cold, that is, the mucous membrane of the upper respiratory tract has appeared inflammatory reaction, due to pathogen infection, such as caused by bacterial infection, blood routine in the white blood cells, neutrophils will be significantly higher. Due to viral infections, lymphocytes and monocytes in the blood routine will also be significantly elevated, and for patients with poor resistance, the metabolism of the liver and kidneys may also be affected, even causing different degrees of damage to the liver and kidney function. At this time, various indicators in the blood will appear different degrees of abnormality, such as transaminases, creatinine, urea nitrogen, etc., which will affect the results of the physical examination. Therefore, it is recommended that after the cold has been completely treated and improved for more than 1 week, you can have your blood drawn at a later date, so that you can objectively clarify the results of your physical examination.