Will Falconer, DVM Moderator
In house titer checks with kits like this are okay, just not as accurate as the "gold standard" test done by KSU. And they don't test for rabies. Yet. Maybe that day is coming.
"Natural exposure" positive titers for rabies are rare and unpredictable in that the virus travels by saliva from a rabid animal. And it doesn't survive very long in the environment. I don't think you could set out to get one with any reasonable hope you'd be successful.