Flu is, in most cases, diagnosed clinically (based on history and symptoms) by a doctor. The doctors, usually, do not recommend any tests. Treatment is started based on clinical signs and symptoms.
Medical history and physical examination: The doctor will take a detailed history of your symptoms. Some of the questions that the doctor may ask include:
On physical examination the doctor will do a detailed general examination with specific attention to your respiratory system (lungs).
Laboratory tests: In most cases, lab tests are not required to diagnose flu. If the infection is severe or the diagnosis is doubtful, the doctor may do tests. Tests that may be done include virus culture or a blood test to detect influenza virus antigen. Sample for examination is obtained by swabbing the nose and throat.
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