16 mos. is a little early I think. My very good friends DD just got diagnosed and she's 3 1/2. The Regional Center I don't think will tell you this early, I believe they will just work with her speech delay. My son also started speech therapy at the Regional Center and we LOVE IT!
I know Kaiser Oakland has a speech therapy program for Apraxia (that's where my friends Daughter goes)
I wish you the very best! we have been in speech now for almost 3 yrs