I just come back from my doctor appt and he want me to come back in 4 weeks (when i am 17 weeks preg) to get a Triple Scan Blood Test. I know what he is testing for, i just want to know where he is going to get the blood from. I know that this may sound strange or whatever, I just want to know if he is going to take the blood from my arm or from the baby?!? Any help would be greatly appreciated.