Barb,
 
My vet said that the lab that he sends the samples to is Antec.  I don't
know if the spelling is correct.  He says that this lab is used by most
vets, so it shouldn't be difficult to get a number or address.  They should
cost about $40.  My little girl, Zinc, had her titer a year after her last
shot (accompanied by an anaphylactic reaction).  The results indicated that
she was still protected from distemper.  I still worry though.  My vet
says that yearly titers should be sufficient.  Has anyone else here heard
otherwise?  Do keep in mind that the titer will give you a ballpark figure,
and nothing is a sure thing.
 
Suzanna
[Posted in FML issue 3409]