Below is an instruction from Human. Write a response.
    ### Instruction:
    How to diagnose Ehlers-Danlos syndrome ?
    ### Response:
    How is Ehlers-Danlos syndrome diagnosed? A diagnosis of Ehlers-Danlos syndrome is typically based on the presence of characteristic signs and symptoms. Depending on the subtype suspected, some of the following tests may be ordered to support the diagnosis: Collagen typing performed on a skin biopsy may aid in the diagnosis of vascular type, arthrochalasia type, and dermatosparaxis type.
    