Dog heartworm test cost calculator
Work out what a heartworm test will cost from the exam fee, the antigen test itself, any upgrade to a combo test that also screens for tick-borne disease, and lab handling. Most practices will not refill a preventive prescription without a current negative result, so the test and the year of prevention arrive as one decision. The calculator adds up your quote and shows which line is doing the work.
Typical range $240 – $450
- Vet exam or office fee$60
- Heartworm antigen test$45
- Combo upgrade, tick-borne screen$15
- Lab handling or send-out fee$0
- Twelve months of preventive$180
- Total$300
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$120 to $400 is the usual annual package: exam, the cartridge, and twelve months of weight-banded preventive.
What this assumes, and where it could be wrong
Every one of these is a place the number could be off. They are here because you should be able to check our working, not because we are hedging.
THE TEST IS THE SMALL LINE; THE YEAR OF PREVENTIVE IS THE REAL NUMBER.
A current negative result is what gets the prescription written. Heartworm preventive is a prescription medication in the US, and vets generally require a recent test before writing or refilling it, including for the online pharmacies that ask for authorisation. The reason is clinical rather than commercial: giving a preventive to a dog that already carries adult worms can cause a dangerous reaction as microfilariae die off. That requirement is why the test tends to arrive as an annual event rather than something you choose year by year.
The combo cartridge is usually a small step up from the plain test. The same sample can be run on a cartridge that screens for tick-borne infections alongside heartworm, and practices in tick-heavy regions often default to it. Whether the upgrade earns its keep depends on where your dog spends time rather than on the price difference, so ask which cartridge the quote assumes before comparing two clinics line for line.
A positive result changes the arithmetic entirely. Treating an adult heartworm infection is a months-long protocol of injections, steroids, strict exercise restriction and follow-up testing, and it sits in a different order of magnitude from screening. That gap is the argument for the annual test: it is a modest recurring line that catches the expensive outcome early, and this calculator prices the screening path rather than the treatment path.
The defaults are ours and are a starting point. The exam fee, the test, the combo upgrade and the preventive price are yours, and the preventive line in particular moves with your dog's weight band. Ask for the itemised annual figure rather than the visit figure, since the prescription is the part that repeats.