Influenza Virus Genotyping (Serum/Plasma)

Why This Test Is Done

Your healthcare provider may order this test if you have symptoms of the flu (such as fever, cough, or body aches) and suspect an influenza infection. Genotyping can also be used in research or outbreak investigations to track virus spread and guide public health responses.

What to Expect Before the Test

No special preparation is needed. A blood sample will be drawn from a vein in your arm. You may feel a slight pinch, but the process is quick and usually not painful. If you’re on blood-thinning medication, let your provider know before the test.

How the Test Works

The test involves analyzing a small amount of your serum or plasma to detect specific genetic fragments (nucleic acid sequences) of the influenza virus. Advanced laboratory techniques, such as polymerase chain reaction (PCR) or sequencing, are used to identify these sequences.

What the Results Mean

Results show which genetic variants of the influenza virus are present. These variants help healthcare providers determine the most appropriate antiviral medications or vaccines to treat or prevent infection, especially in cases where standard treatments may not be effective.