renaultf1,
I wish the state would also accept titers for rabies, but maybe in the future they will.
There is an in-house titer kit available from Synbiotics in San Diego called "TiterChek" that vets can do at their office to check for adequate antibody levels on a pass/fail basis – it won't give you a specific antibody count the way a titer sent to a lab will, but it will let you know if your animal has enough to protect them. We have those done whenever we need to board our dogs rather than having boosters.
Kris