Hi Smidgin, Don't be "pretty sure" you want this test. You want this test. It not only screens for PKU but other birth defects. My daughter was born in December positive for PKU. When it comes to this disease time is brain.
It is extremely rare. You will probably never be affected by it or even meet anyone that has it. But if your child has it -you want to know. You can prevent extreme retardation, seizures and a host of other undesirable issue with diet. I will have a normal healthy daughter because of this test. It's not worth it to NOT get this test.