What are the tests for gingivitis?

See a periodontist. You are best seeing a dentist who can examine you and evaluate your gum condition. Signs of gingivitis are sometimes swollen gums and/or bleeding gums also possible bad breath from food particles, plaque or acid products it is easy to treat in its early stage.
Bleeding. If your gums bleed when brushing or flossing, that is the distinguishing factor for gingivitis. It may also be a sign that you have a more serious problem, that of periodontal or gum disease; and only your dentist can test for that by taking simple measurements around each tooth and appropriate x-rays.