At vet Hospital I work at we do a saliva test. It is much simpler. All we do is put this plastic stick in the cats mouth for 5-10 sec then we put the stick w/saliva on it in a chemical. If the cats has the desease the chemical will change to a blue color in 10 min. If it doesn't the chemical stays clear. It is less stressful for the cat and us becasue we don't have to take blood.