I get often asked the question, how has the flu diagnosed? Flu is usually diagnosed by taking a sample of mucus. It is done by wiping along a cotton, swab through the nose or throat. The results might be ready quickly, or it can take longer if the test has to be sent to a lab. I often get asked the question about how is the flu treated? People with the flu get better if they stay home until they get better. There are some things you can do to help you get over the flu quickly. Drinking plenty of fluids to prevent dehydration, getting plenty of sleep and rest and try to take some acetaminophen or ibuprofen over the counter for fever or pain. Doctors may prescribe antiviral medications. Best way to get those is within 48 hours of symptoms. And it's known to shorten the duration of the flu by one to two days. It is important to ask questions about potential side effects of any medications you take as part of prevention. Best way to prevent a flu is to take a flu vaccine every year.