Got a microscope from a friend a short time ago used it like a maniac and told a couple of the members on this site with the over use I felt that somebody had hit me in the eye with a hammer . But what I would say just looking at the birds droppings the texture, shape, and colour, will let you know what's going on. . Would also like to add have never sent droppings away to be tested and I never will. If my birds are not right I definitely don't need to pay somebody to tell me so.