Below is an instruction from Human. Write a response.
    ### Instruction:
    How to diagnose Schnitzler syndrome ?
    ### Response:
    How is Schnitzler syndrome diagnosed? A diagnosis of Schnitzler syndrome is often suspected based on the presence of characteristic signs and symptoms identified through physical exam, laboratory studies (i.e. immunoelectrophoresis) and/or imaging studies. Additional testing should also be ordered to rule out other conditions that cause similar features.
    