Concerned about my wife getting Amniocentesis test (please read)...?

the results are NOT 100%. The only reason you would consider doing the procedure is if you are the type of people that would terminate your child's life because they "might" have a medical condition. Defects of the brain and heart are better determined with the 20 week ultrasound and you have no risk of causing a miscarriage. My OB Doctor here in the US is required to offer the test, but they in no way recommend it because of it's inaccuracy. Your doctor will make a great deal of extra money by doing the test and that is probably the reason he is insisting.