technically, here in maine, it is one of the tests mandated by the state. but all you have to do is sign a simple waiver declining it if you'd like to. no big deal at all to decline. i waived it for my son without a problem.
i guess it might depend on your doctor/pediatrician too and how comfortable they feel with it, in terms of any pressure they might give you. but ultimately, like anything, you can decline as long as you sign a waiver.