The specific blood tests ordered will depend on the suspected virus and the patient's clinical presentation. Blood tests for viral fever may include: Complete Blood Count (CBC): To measure various blood components, including white blood cells, red blood cells, and platelets, to assess for signs of infection. Viral Serology: Testing for specific antibodies or antigens associated with the suspected virus. PCR (Polymerase Chain Reaction): To detect the virus's genetic material, directly diagnosing the viral infection. Liver Function Tests: To evaluate liver health, certain viral infections can affect the liver.