Do You Need a Flu Test?

Most people do not need a flu test. However, a healthcare provider may recommend a flu test if:

  • The infected person has close contact with others who are at high risk of flu complications.

  • The infected person is in a hospital, long-term care facility, or other settings where measures are needed to prevent the spread.

  • The person has risk factors for flu complications.

  • There is a local flu outbreak being monitored by health authorities.

 

How Common Is the Flu?

  • The CDC reported 40 million flu cases during the 2023-2024 flu season.

  • This data may not fully represent the actual flu burden in the U.S. because many people don't seek care for flu symptoms.

 

Types of Flu Tests

Rapid Tests

  • The most common flu test is the "rapid influenza diagnostic test" (RIDT), which detects the antigen of the flu virus.

  • Another test, the "rapid molecular assay," detects the virus’s genetic material. Both tests give results in 10-20 minutes.
     

Tests in Hospitals or Public Laboratories

  • Tests in hospitals or public labs, like RT-PCR tests, viral cultures, or immunofluorescence assays, are more accurate but take several hours for results

 

What to Do After a Positive Flu Test

Get Treatment

  • If the flu test is positive, your healthcare provider will decide whether you need antiviral treatment like Tamiflu (oseltamivir).

  • Tamiflu is most effective when taken within 48 hours of symptom onset.
     

Prevent the Spread

  • Cover your nose or mouth when coughing or sneezing.

  • Limit contact with others, disinfect surfaces, and wash your hands frequently.

  • Stay home until at least 24 hours after your fever has gone.

 

A Quick Review

It can be hard to know when to get a flu test, especially since many illnesses cause flu-like symptoms. Getting a flu test can confirm the diagnosis and help guide treatment if you're at risk for severe complications.