Influenza A and B Antigen Detection in Nasopharyngeal Aspirate

What This Test Measures

The test looks for the presence of viral antigens (proteins) from influenza A and B. These proteins are unique markers that appear when the viruses are actively multiplying in your respiratory tract. The method used is typically rapid immunoassay (often involving a lateral flow device), which provides results in minutes.

How the Test Works

When you provide a sample of your nasal secretions (nasopharyngeal aspirate), the test detects the viral antigens. The sample is applied to a test strip where antibodies specific to influenza A and B bind to the antigens if they are present. This binding creates a visible signal (often a colored line) indicating a positive result.

When You Might Need This Test

This test is commonly used during flu season or when flu-like symptoms are suspected. It is often performed in healthcare settings like clinics, urgent care centers, or during outbreaks to quickly identify influenza infections in patients with symptoms such as fever, cough, sore throat, or body aches.

What the Results Mean

A positive result means the test detected influenza A or B antigens in your sample, suggesting you are likely infected with one of these viruses. A negative result means the test did not detect these antigens, but it does not rule out other causes of your symptoms. Results should be interpreted by a healthcare provider.