thank you very much from both of you foufouka and jakesmom . you gave me very complete explanation .
In Iran , they said these tests is just for specifying the kind of mutation . and not the kind of pku or the amount of phe that the body can tolerate or the kind of treatment . and just is useful for when you want to have another child for amnioparacentesis and I dont know wether it has worth or not ? because even I would understand that my germ has pku , I wont abort him or her .