Three tests cover most of what a new cat can hand you: feline leukemia virus, feline immunodeficiency virus and a fecal exam. Together they cost 80 to 200 USD at most clinics and return results inside 1 visit. The part adopters get wrong is not the tests, it is the 2-week window around them and the 4 records nobody keeps, which is why a positive result at the first vet visit feels like a betrayal rather than a data point.
The three tests, and what each one answers
FeLV is an antigen test, usually a rapid immunoassay on 0.5 mL of blood, read in 10 minutes. It answers whether virus protein is circulating, which is the question that matters for a cat living with other cats. FIV is an antibody test on the same sample, same 10 minutes; it answers exposure, and a positive result in a cat over 6 months is usually a true positive, while one in a kitten under 6 months is often maternal antibody that will clear.
The fecal exam is the one people skip and the one that pays out most often. A direct smear plus a float finds roundworms, hookworms, tapeworm segments, coccidia and giardia cysts in 15 to 30 minutes, on 3 to 5 g of fresh stool. A kitten with a belly like a drum and 2 weeks of soft stool usually has 1 of those 4, and the fix costs less than the test.
What the 3 tests cost
| Item | Typical cost (USD) | Result in | Sample |
|---|---|---|---|
| FeLV antigen, rapid | 35 to 60 | 10 minutes | 0.5 mL blood |
| FIV antibody, rapid | 35 to 60 | 10 minutes | same sample |
| FeLV and FIV combo | 45 to 80 | 10 minutes | same sample |
| Fecal float plus smear | 25 to 55 | 15 to 30 minutes | 3 to 5 g stool |
| Giardia antigen | 30 to 55 | 15 minutes | same stool |
| Package total | 80 to 200 | 1 visit | 1 blood draw, 1 stool |
The combo test is cheaper than 2 separate tests at almost every clinic, so ask for it by name. If the shelter already ran one, ask for the date and the assay name, because a result from 5 months ago on a cat that has been in a run with 40 others is history, not a clearance.
Why the 2-week window exists
Two things take 2 weeks: confirmation and exposure. A positive FeLV rapid test should be confirmed by a second method, either IFA or PCR, and most protocols book that within 14 days rather than treating the first result as final. The same gap covers exposure: a cat infected 3 days before the test may still read negative, and a repeat at 2 to 4 weeks catches the ones that turn.
For adoption logistics, a 2-week window means the screening result you rely on should be no older than 14 days at pickup. If the cat was tested at intake, tested again 2 weeks later and then moved to a foster home, you have a valid pair. If the only test is from intake and the cat has been in group housing since, pay the 45 to 80 USD again.
The 4 records to keep
Four items, on paper, before the cat leaves the building. First, the test date, because a result without a date is a rumor. Second, the assay name and manufacturer, since rapid tests differ in sensitivity and a vet will ask. Third, the result itself with the value, not just positive or negative, including any titer or S/CO number printed on the reader. Fourth, the signature and clinic stamp of the person who ran it, which is what an insurer or a second vet will want when a dispute starts.
Photograph all 4 before you leave and keep them in a folder. Shelters lose paper; a phone photo has saved more adoptions than any filing system.
Reading a positive result without panicking
A FeLV positive cat is not a cat with a death sentence. Some cats clear the virus and become regressive, some stay persistently positive and live for years with monitoring, and the difference shows up on a repeat test at 6 to 8 weeks plus a PCR. A FIV positive cat with no symptoms can live a normal lifespan indoors, and the main rules are no raw food, 6-month vet checks and separation from FeLV positive cats.
What a positive result does change is housing: 1 cat, indoors, no group of 6. That is a placement decision, not a euthanasia decision, and any shelter that presents it as the latter is a shelter to walk away from.
What these 3 tests do not cover
They do not test for feline coronavirus or FIP, ringworm, heartworm, dental disease, hip or heart problems, or the behavior that decides whether the cat hides for 3 weeks. Add a fungal culture only if there are lesions, a heartworm antigen test in endemic areas at 30 to 50 USD, and a physical exam with a mouth check, which is where 1 in 3 cats over 3 years shows something.
A negative triple test is a starting line, not a warranty. It means the 3 most common transmissible problems are not there today; it does not mean the cat will not develop kidney disease at 9.
What skipping the tests costs
Skip the fecal and a roundworm-positive kitten means 2 more cats treated, 3 litter boxes emptied, and 1 vet visit at 90 to 150 USD. Skip FeLV screening in a multi-cat home and 1 positive cat can expose the rest, with a 3 to 6 week retest cycle for every cat in the house. The 80 to 200 USD upfront is the cheapest line in the entire adoption file.
Put it against the rest: a first-year budget of 1,200 to 2,000 USD, a dental at 300 to 800 USD, and an emergency visit that starts at 200 USD before any treatment. The cost breakdown shows where screening sits, and it is near the bottom of the list for a reason.
Before pickup
- Ask for the combo FeLV and FIV test by name, not a general health check.
- Add a fecal float plus smear on fresh stool, 3 to 5 g, same day.
- Check the test date and refuse anything older than 14 days at pickup.
- Photograph the 4 records: date, assay, value, signature.
- Book the first vet visit within 72 hours, and bring the records plus the screening and safety checklist.
If the cat came from a foster home rather than a run, the exposure risk drops and the records are usually better; foster-to-adopt explains why that path produces cleaner files, and what to verify before you treat a foster history as a clearance.
Terms mentioned in this article
Frequently asked
Is the 80 to 200 USD screening really necessary for an indoor cat?
Yes, because the result changes housing and timing rather than just risk. FeLV decides whether the cat can join a multi-cat home, and the fecal decides whether 2 weeks of soft stool is a worm or a diet problem. Skipping it usually costs more at the first vet visit than the whole package.
What does a positive FIV test mean for adoption?
It means the cat carries antibodies, usually from a bite wound years earlier, and most positive cats live a normal indoor lifespan with 6-month checks and no raw food. It does not require isolation from people, and it does not mean the cat cannot be adopted with another stable cat after a slow introduction.
How old can a screening result be at pickup?
Treat 14 days as the practical limit, and anything older as a new test. A cat that has been in group housing since the sample was taken has had new exposure every day, so a 3-month-old negative result says almost nothing about the cat you are taking home.
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