Below is an instruction from Human. Write a response.
    ### Instruction:
    How to diagnose Waardenburg syndrome type 2 ?
    ### Response:
    How is a subtype of Waardenburg syndrome type 2 diagnosed? Subtypes of Waardenburg syndrome type 2 are determined by the suspected genetic cause of the condition in a family.  In some subtypes, the genetic cause is a known gene.  In other subtypes, the general location (locus) of the genetic cause has been identified, but the specific gene is not yet known.
    