Below is an instruction from Human. Write a response.
    ### Instruction:
    How to diagnose Cold agglutinin disease ?
    ### Response:
    How is cold agglutinin disease diagnosed? A diagnosis of cold agglutinin disease may be made after several types of tests are performed by a health care provider. In some cases, the diagnosis is first suspected by chance if a routine complete blood count (CBC) detects abnormal clumping (agglutination) of the red blood cells.
    