Can a CBC test detect infections?

Yes, a CBC test can detect signs of infections by evaluating the number and type of white blood cells (WBCs). An elevated WBC count, particularly of neutrophils, often indicates a bacterial infection, while higher levels of lymphocytes can suggest a viral infection. The test can also show whether the immune system is responding to infection or inflammation. Based on the results, your healthcare provider may order additional tests, such as cultures or imaging, to identify the specific cause of infection and guide treatment.