There are 2 inexpensive in-house titer kits available to veterinarians (see below).
Here's the link for the 15 minute in-house titer tests for distemper and parvo: TiterChek Synbiotics
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From an article entitled, Ask Your Vet for TiterChek by Rhonad L. Rundle, 07/31/02 The Wall Street Journal
"Michael Dutton, a veterinarian and owner of Weare Animal Hospital in Weare, N.H., says the new TiterChek can help him and his clients determine which pets need a booster. ...... Dr. Dutton says he is charging clients $30 for the new in-office TiterChek test. That's less than half his $64 charge for the lab tests, which take 10 days and require mailing specimens overnight in ice packs. "
VACCICHECK
Biogal Home - Veterinary Supplies | Antibody Tests Vet Kits | Tools for Veterinary Diagnosis : Here's the link to Dr. Schultz's Summary Results on his testing of VacciCheck for the USDA
Biogal Home - Veterinary Supplies | Antibody Tests Vet Kits | Tools for Veterinary Diagnosis