A rise in specific antibodies has to be
detected via blood testing in order for a proper diagnosis to be made, so it doesn't show up on regular bloodwork (though patterns can be spotted that should clue your physician into requesting further testing for a diagnosis).
Unlike the other worms described, heartworms are
detected via a blood test, which will be necessary before beginning any heartworm preventive regimen.
Not exact matches
Feline leukemia is diagnosed
via a
blood test that
detects a protein found in the virus.