Below is an instruction from Human. Write a response.
    ### Instruction:
    How to diagnose Glucose transporter type 1 deficiency syndrome ?
    ### Response:
    How is glucose transporter type 1 deficiency syndrome diagnosed? A diagnosis of glucose transporter type 1 deficiency syndrome (GLUT1 deficiency syndrome) is often suspected based on the presence of characteristic signs and symptoms. Additional testing can then be ordered to confirm the diagnosis.
    