How often should my cat be tested?

We only recommend testing when we think the cat has heartworm. Routine testing is typically not done, probably because there's no treatment for it once the cat has adult heartworms. They don't have microfilaria, which is the baby warm circulating in the blood, so all heartworm preventatives are safe for them. We recommend prevention in cats. In a symptomatic cat, a sick cat, and we suspect heartworms, then we’re probably going to get an x-ray, we screen for antibodies. And do the ELISA antigen test as well.