Below is an instruction from Human. Write a response.
    ### Instruction:
    How to diagnose Postural orthostatic tachycardia syndrome ?
    ### Response:
    How is postural orthostatic tachycardia syndrome diagnosed? A diagnosis of postural orthostatic tachycardia syndrome (POTS) is often suspected based on the presence of characteristic signs and symptoms. Additional testing can then be ordered to confirm the diagnosis.
    