The Cockroach (i6) IgE test measures your body's allergic reaction to the German cockroach, a common insect in cities with mild climates. Being around cockroach allergens can lead to asthma, especially in kids and young adults. This test, which checks the level of IgE antibodies in response to cockroaches, helps Providers diagnose allergies. It's done in a lab and should be used alongside other health info for the best results.