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U.S. Department of Health and Human Services

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Fact Sheet for Patients: Understanding the DIATHERIX H1N1-09 Influenza Virus Test Results

The information previously contained on these webpages were authorized under the 2009 H1N1 Influenza Emergency Use Authorizations (EUAs). As of June 23, 2010, the EUAs have been terminated and this information is no longer current.

An emergency has been declared by the Secretary of Health and Human Services because of the outbreak caused by the 2009 H1N1 flu virus. This virus has also been referred to as swine influenza (H1N1) virus. This Fact Sheet will refer to the virus as 2009 H1N1 influenza virus. The Food and Drug Administration (FDA) has authorized the emergency use of the DIATHERIX H1N1-09 Influenza Virus Test to test for the presence of 2009 H1N1 flu virus in clinical respiratory specimens collected via nasopharyngeal swabs, nasal swabs, throat swabs, nasal aspirates, or nasopharyngeal aspirates. This authorization will terminate on April 26, 2010, when the emergency has ceased to exist, or when the authorization has been revoked, whichever is earlier. The information in this Fact Sheet is the minimum necessary to inform you of the significant known and potential risks and benefits of the emergency use of the DIATHERIX H1N1-09 Influenza Virus Test.

Why was my sample tested using the DIATHERIX H1N1-09 Influenza Virus Test?

Your sample was tested using this test because you may have been infected with the 2009 H1N1 flu virus. This test could help to determine whether you are infected. The results of this test, along with other information, may also help your doctor take better care of you.

What is 2009 H1N1 flu?

The 2009 H1N1 flu is a respiratory disease caused by type A influenza virus. Human cases of novel H1N1 flu virus infection have been identified in the United States and internationally. The Center for Disease Control and Prevention (CDC) has determined that this virus is contagious and is spreading from person to person. Like seasonal flu, the 2009 H1N1 flu can vary in severity from mild to severe.

What is a 2009 H1N1 Influenza Test?

The DIATHERIX H1N1-09 Influenza Virus Test, a 2009 H1N1 Influenza Test, is a test performed to detect the 2009 H1N1 flu virus. The FDA has not cleared or approved this test and there are no FDA cleared or approved tests that can identify the 2009 H1N1 flu virus. Based on data submitted to FDA, FDA has granted an Emergency Use Authorization for the DIATHERIX Laboratories H1N1-09 Influenza Virus Test.

  What are the known risks and benefits of a 2009 H1N1 Influenza Test?

Besides minimal potential discomfort during sample collection, there is a very small risk of a reported incorrect result. (See next paragraph for more information). The results of this test from nasopharyngeal swabs, nasal swabs, throat swabs, nasal aspirates, and nasopharyngeal aspirates, along with other information, can help your doctor take better care of you. Knowing your test results may help you to prevent the spread of the virus to your family or others.

If this test is positive for 2009 H1N1 flu, does that mean that I have 2009 H1N1 flu?

Yes, although there is a very small chance that this test can give a result that is wrong. There is a small chance of an incorrect positive test result (false positive) or an incorrect negative test result from a patient infected with the 2009 H1N1 flu virus (false negative). Your doctor may decide how to care for you based on the test result along with other factors.

If this test is negative, does that mean that I do not have 2009 H1N1 flu?

Most, but not all, people with 2009 H1N1 flu will have a positive test. Therefore, if your test is negative, something else may be responsible for your illness. However, there is a small chance that this can give a negative result that is wrong (called a false negative) meaning you could possibly still have flu even though the test is negative. Therefore, while a negative test most likely means you don't have flu, your doctor must consider the test result together with all other aspects of your illness in deciding how to treat you.