Thank you FireTiger for your post and I do totally agree with you. My whole point was to explain there is a limit to what a doctor can tell about a person. Yes, there are all kinds of test that can be used for different situations, some reliable some not, some accredited some not, some accepted some not. Again you are right that, at birth, a doctor only runs necessary test on a baby, cost and ethics play a role. Knowing parents have a concern about their baby, perhaps the doctor will use a test that will relieve their concern. However, a doctor should never mis-led parents to think there is a test for any reason where their concern can not be determined (example: height, weight, personality).
As I've said here before, there is no test to prove I, rolling7, was born straight, bi, gay, etc. But there are test that can say I was born male, white, etc.