Below is an instruction from Human. Write a response.
    ### Instruction:
    How to prevent Thalassemias ?
    ### Response:
    You cant prevent thalassemias because theyre inherited (passed from parents to children through genes). However, prenatal tests can detect these blood disorders before birth.
                
Family genetic studies may help find out whether people have missing or altered hemoglobin genes that cause thalassemias.
    