Below is an instruction from Human. Write a response.
    ### Instruction:
    How to diagnose Metachromatic leukodystrophy ?
    ### Response:
    Who might consider genetic carrier testing for a family history of metachromatic leukodystrophy? If someone has a family history of metachromatic leukodystrophy (MLD) or someone is known to be a carrier for MLD, individuals who are biologically related to the affected individual or carrier are at risk to be a carrier.
    