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
Another way to
detect blood doping is
via the «biological passport,» adopted by WADA in 2009, which tracks
blood parameters such as hematocrit and hemoglobin on a longitudinal basis, looking for changes indicative of possible doping.
Feline leukemia is diagnosed
via a
blood test that
detects a protein found in the virus.