Heartworm testing is performed to determine if a pet is infected with
heartworms (Dirofilaria immitis).

Many veterinarians use a popular test called a “SNAP” test, which can be
run in just a few minutes at your veterinarian’s office.

Sometimes, additional testing is performed to gain more information
about the extent of heartworm infection for a particular patient.

Heartworm testing is recommended for most dogs before beginning a
heartworm preventive program. Periodic testing is also recommended for
dogs already on heartworm preventive medication.

Testing blood for microfilariae: Using a small blood sample, your
veterinarian can detect heartworm microfilariae in your dog’s blood.



Antigen testing:



“Antigens” are proteins that the body can recognize as belonging to a foreign
organism. By identifying certain antigens that are found in adult female
heartworms, researchers have developed tests that can detect these antigens
to tell if a dog is infected with adult heartworms.

Many veterinarians use a rapid-result test called a “SNAP” test to diagnose
heartworm disease in dogs.

The SNAP test is very accurate, can be performed in your veterinarian’s
office using a very small amount of blood, and takes only a few minutes to
complete.

There is even a combination SNAP test that can detect heartworm disease as
well as three tick-associated diseases (Lyme disease, anaplasmosis, and
ehrlichiosis) at the same time.

If your veterinarian obtains a questionable result on the SNAP test,
additional testing may be recommended.

Over time, heartworms can start to cause damage to the heart, lungs, and
associated blood vessels.

If this damage has occurred, your veterinarian may recommend additional
testing to determine the extent of your dog’s illness.

Additional tests may include radiographs (x-rays) to check your dog’s heart
and lungs for evidence of damage; ultrasound studies to check for specific
injuries to the heart; and additional blood work to check the liver, kidneys,
and other major body systems for evidence of damage.