Below is an instruction from Human. Write a response.
    ### Instruction:
    How to diagnose Down syndrome ?
    ### Response:
    How is Down syndrome diagnosed? Down syndrome may be suspected and/or diagnosed during pregnancy, or after a child is born. During pregnancy, a woman can opt to have specific tests that may either screen for, or diagnosis, Down syndrome in a fetus. A screening test poses no risks to the fetus and can determine the likelihood that a fetus has Down syndrome.
    