The most common exams to identify Tango2 mutations are:
-Whole exome sequencing (WES)
-Whole genome sequencing

Once diagnosed, it may be useful to register in the UMDF registry.
Registering allows researchers to find you and ask if you want to participate in any studies. This is a family registry and you can set up any privacy setting that you would like to have. It is not just for US patients, there are many countries participating.