Testing for Alternaria alternata infection can be done through a skin prick test or a blood test to measure the levels of IgE antibodies specific to Alternaria alternata. These tests can be performed by an allergist or immunologist. A doctor may also perform a physical examination and review medical history to diagnose Alternaria alternata-related conditions such as asthma or allergic rhinitis. If you suspect that you have been exposed to Alternaria alternata and are experiencing symptoms, it is important to consult a healthcare professional for proper diagnosis and treatment.