👉 The IRS Fluid, also known as the Fluorescein Diacetate (FDA) test, is a blood test used to detect the presence of influenza virus in an individual. It works by injecting a small amount of fluorescent dye into the bloodstream, which circulates and binds to the virus if it's present. The test measures the fluorescence intensity in a blood sample taken a few hours later; higher levels indicate a greater viral load, suggesting a possible flu infection. This test is commonly used in healthcare settings to diagnose flu cases and monitor the effectiveness of antiviral treatments, though it's important to note that it's not 100% accurate and should be interpreted alongside clinical symptoms and other diagnostic methods.
