Many women have normal thyroid function .
Many women have immunological evidence of thyroid autoimmunity ( as evidenced by autoantibodies ) or are iodine deficient , and develop evidence of hypothyroidism before or after giving birth .
Many women have normal thyroid function but have immunological evidence of thyroid autoimmunity ( as evidenced by autoantibodies ) or are iodine deficient , and develop evidence of hypothyroidism before or after giving birth .