H1N1 Swine Flu test is a blood test which measure the level of Swine Flu Antigen in the blood.It is performed to confirm Swine Flu. This test is also helpful during and after the treatment of Swine Flu. Tests are performed for routine health checkups or if a disease is suspected. This test is used to check if there are improvements or deterioration is one’s medical conditions.It may also be used to measure whether the medication and the treatment you went through was successful or not.