The flu is a respiratory illness triggered by infection with an influenza virus. Our guide explains the types of flu tests and when and how they may be used.
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Arthritis is the leading cause of disability in the United States. Learn about types of arthritis and the role of arthritis testing.
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Hepatitis is inflammation of the liver. Learn more about types of hepatitis and tests that may be used to diagnose, evaluate, and monitor this condition.
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