You don't really need to do it unless you show your birds or just want to have it done. Testing is required at shows but If you don't have them tested then there are testing agents at the shows that will test the birds you're showing. Having them tested at my place I get a card in the mail that shows my flock has been tested so when I check in I don't have to have the birds tested at the shows I show them my card when I check in then coop my birds.