When my daughter was diagnosed with H1N1, I was told by the dr.'s office that they test for Type A and B flu. A includes, but not limited to H1N1. B includes, but is not limited to seasonal flu. However, the only known types of flu circulating right now are seasonal and H1N1. So if you are positive for Type A they assume you have H1N1. I also believe that if you test positive for Type A they forward those to the CDC.