7 Coggins Test Facts Every Horse Owner Needs to Know
A Coggins test is a blood test that checks a horse for antibodies against equine infectious anemia (EIA), a viral disease with no vaccine and no cure, and a negative result is the paper every US state asks for before a horse crosses its border, as Penn State Extension confirmed in 2022. In practice that paper works as your horse's passport: shows and auctions ask for it too, and in some states so do boarding stables. The USDA recommends testing every horse once a year.
Picture a trailer loaded for a show two states away, and an event official at the gate asking for the Coggins papers. The federal guidelines tell event officials to review the official test papers of every horse entered, so a paper that expired last month means the horse stays on the trailer. If you've ever hunted for that paper, you know where it tends to be: the original in a folder at home, a copy in the trailer's tack room, the electronic one in an email from the vet's office, and the test date, which the 12 months count from, printed in small type on all three. With two or three horses, each tested in a different month, nobody keeps those dates in their head until the barn manager or the show office asks.
The 7 key facts
| Key fact | In short |
|---|---|
| 1. What it tests for | Antibodies against equine infectious anemia (EIA), which has no vaccine or cure |
| 2. Who does it | An accredited veterinarian draws the blood; a USDA-approved lab runs an AGID or ELISA test |
| 3. What the result means | Negative: no antibodies on the day of the blood draw. Positives are rare: 100 in 1,345,453 US tests in 2025 |
| 4. When you need it | To cross a state line, and often for shows, sales and some boarding barns |
| 5. How long it is good for | Usually 12 months from the blood draw, shorter in some states and for some sales |
| 6. What it costs | About $125 on average with the vet visit, in a 2023 Oregon State University Extension figure |
| 7. Where to keep it | Where you can show it at the gate; Virginia, for one, accepts a legible digital copy |
On this page
1. A Coggins test checks for equine infectious anemia (EIA)
What does a Coggins test for? It looks for antibodies against the equine infectious anemia virus; the American Association of Equine Practitioners (AAEP) explains that "a positive test indicates the presence of EIA-specific antibodies". Because infected horses "become lifelong carriers", a confirmed positive in an adult horse means it is infected for life.
What is equine infectious anemia?
Equine infectious anemia is in the USDA's words a "viral, and sometimes fatal, disease that only affects equids". Its old nickname, swamp fever, comes from the mistaken belief that it only occurred in wet southern regions, as the Nebraska Department of Agriculture explains; Coggins disease is listed among its common names in a 2000 Bureau of Land Management note by a University of Kentucky veterinarian. The virus travels in blood: biting flies, mostly horse flies and deer flies, carry it on their mouthparts, according to the AAEP, and reused needles, syringes and unscreened blood products are now "the most common way EIA spreads in the United States".
Symptoms and impact
Sick horses can show fever, weight loss, weakness, anemia and swelling, but the AAEP notes that "most infected horses are asymptomatic, showing no signs of disease", and "there is no treatment or vaccine," the USDA states. A carrier can look perfectly healthy in the next stall, so testing is how carriers are found.
2. An accredited veterinarian must draw the blood
A horse Coggins test starts with an accredited vet drawing a tube of blood and filling in the official form, then a USDA-approved lab tests the sample and reports it as negative or positive. You can't draw it yourself: the New Hampshire state lab, for example, only accepts samples from Category II accredited veterinarians.
The process
Whether you call it a Coggins horse test or an EIA test, the Coggins test procedure is mostly paperwork around one blood draw. The form requires a written description of the horse's white markings, brands, scars and whorls "regardless of whether photographs or line drawings are submitted", and the day the blood is drawn is "the official test date", so the 12 months start then. Every Coggins test equine practitioners send in goes to one of about 400 USDA-approved labs, which run the agar gel immunodiffusion (AGID) test or an ELISA; owners call both results "Coggins papers".
Digital vs. paper forms
The paper form is VS 10-11, and electronic versions such as VSPS, GlobalVetLink and VetSentry are also official; for those, the New Hampshire lab asks for three photos, front, left and right, without blankets. Some labs now send results only by email: the North Dakota State University lab, for example, no longer mails original paper reports unless the vet asks for one.
3. A negative result is your horse's passport
A negative Coggins test means no EIA antibodies were found on the day the blood was drawn; a positive result starts quarantine and a confirmation test, and a confirmed positive adult horse stays infected for life. Positives are rare: the USDA found 100 positive horses in 1,345,453 tests in 2025, 52 of them in Texas.
Interpreting the paperwork
A negative result is a snapshot. A recently infected horse can test negative at first, because it may take 60 days or more for antibodies to show, so the AAEP advises testing any horse with an unknown status when it is bought or arrives at a new barn. A positive ELISA isn't the final word either: it gives more false positives, so federal guidelines require it to be confirmed with the AGID.
What happens if a test is positive?
What happens if a horse tests positive for Coggins is set out in the federal guidelines: quarantine within 24 hours, and, as the AAEP describes, a new sample taken by a state or federal official for confirmation at the National Veterinary Services Laboratories (NVSL). A confirmed positive horse is marked with the state's number and the letter A, as federal law describes, and the AAEP names "euthanasia or lifetime quarantine with permanent isolation at least 200 yards away from non-infected horses", noting that some states require euthanasia. Under the federal guidelines, the other horses on the premises are retested every 30 to 60 days until the results stay negative for at least 60 days.
Foals of a positive mare are a special case: a foal can test positive for more than six months from antibodies in the mare's colostrum, but the virus can also pass to the foal before birth, as the AAEP notes, so such a foal stays in quarantine for at least 60 days and needs a negative test before it joins other horses.
4. You can't cross state lines without a current Coggins
A negative Coggins test for horses is required to cross a state line; the USDA's recommended standard is a test from the past 12 months plus a permit signed by an accredited vet, but each state sets its own rules. The USDA's Uniform Methods and Rules from 2007 are recommended minimum standards; the federal EIA rule itself, 9 CFR § 75.4, only deals with moving positive horses.
US travel and hauling rules
Crossing a state line almost always takes a second paper: a horse health certificate, the Certificate of Veterinary Inspection (CVI), which is often valid for 30 days, as in California. For horses that travel often, many states accept an Extended Equine CVI (EECVI), which Virginia describes as "valid for six months from the CVI inspection date or the Coggins test expiration date, whichever comes first"; South Carolina limits it to travel "for purposes other than change of ownership". Temporary orders, such as North Carolina's screwworm rules in 2026, can add requirements, so check your route on InterstateLivestock.com, run on behalf of the national animal health organizations, or with the state veterinarian before you travel.
Show and boarding facility rules
The federal guidelines tell event officials to check the papers of every horse entered and call for a negative test before any auction sale. Some states go further: Texas requires a test for sales, boarding stables, trail rides and races, Florida for boarding stables, pastures, shows and trail rides, and Pennsylvania allows no show, sale or lease without one. Wisconsin has no state rule for boarding stables. Ask your barn and the show office what they want well before the date.
5. Coggins papers expire, and not always after 12 months
How long is a Coggins test good for? Usually 12 months from the day the blood was drawn: Virginia's agriculture department writes that Coggins certificates "are good for 12 months from the date the blood sample needed for the test was drawn", and Penn State Extension gives the same one year. For a sale, the federal guidelines prefer a test no more than 60 to 90 days old.
The 6 vs. 12 month rule
Coggins test requirements by state differ most in this time window. These are the windows we found on 24 October 2026 in state regulations or official guidance, some through the Cornell Legal Information Institute's copy.
| State | Coggins rule | Source |
|---|---|---|
| Many states | Negative test within 12 months to enter, in line with the federal guidelines | Federal guidelines, Penn State |
| Hawaii | Within 90 days of shipment, health certificate within 7 days | Hawaii Department of Agriculture |
| Alaska | Within 180 days of departure | USDA APHIS |
| Connecticut | Within 60 days for a public auction (2021 requirements) | Connecticut State Veterinarian |
| New Jersey | Blood drawn within 90 days before a sale | N.J.A.C. 2:5-4.4 |
| Massachusetts | Within 6 months for an auction or sale | Mass.gov |
| Delaware | Within 6 months for a sale or auction (2005 regulation) | Delaware regulation 904 |
| Louisiana | Within 6 months of a sale | Louisiana Department of Agriculture |
Young foals can be exempt: for foals under six months traveling with a mare that tested negative, the federal guidelines allow the test to be waived, and several states exempt them, California among them. With an EECVI, the travel permit runs out when the Coggins does, so a late renewal ends both.
6. What a Coggins test for horses costs
A Coggins test averaged about $125 including the vet's visit in a 2023 Oregon State University Extension figure, while two state university labs we checked, in New Hampshire and North Dakota, charged $9 to $25 for the test itself in 2026. We found no national price survey from an official source.
Cost breakdown
Coggins test costs at the lab are small: New Hampshire charges $10 for an AGID and $25 for an ELISA, and North Dakota State University lists $9 for the ELISA plus a $12 accession fee per case. The rest of the bill is the farm call, the blood draw and the paperwork.
How to save
- Test horses together. Ask the vet to test several horses on one farm call; Louisiana's state lab charges a single $8 accession fee for a batch from the same owner and vet sent at the same time.
- Skip the rush. In New Hampshire the next-day AGID costs $10 against $25 for the same-day ELISA.
- Get the form right. The North Dakota State University lab charges $15 to correct a paper form or a report, for example for a wrong ID or a missing collection date.
7. Keep the Coggins where you can show it
A Coggins only helps if you can show it when a show office, a buyer or a new barn asks, and Virginia, for one, says a "legible paper or digital copy of an original Coggins is acceptable" unless an event organizer asks for the original. With several horses the test dates drift apart, and each horse has its own deadlines: the Coggins, the EECVI that expires with it, and the vaccines the barn asks about. Writing them down once per horse means you check one list instead of three folders the night before you load the trailer.
Never let your horse's Coggins fall out of date
The Coggins is a yearly blood test, as the USDA recommends for every horse, but the paper, the test date and the state rules decide whether your horse can travel, show or move barns. Keep the result with the horse's other health records, know when each horse's blood was drawn, and check the rules of every state on your route before you leave.
Frequently asked questions about the Coggins test
How long does a Coggins test take to get back?
In the lab, federal guidelines say an ELISA result "can be obtained within a few hours, compared to the 24 hours minimum required with the AGID test". The North Dakota State University lab gives a turnaround of 1 to 2 days and tests only on Tuesdays and Fridays from October to February; shipping and any confirmation at NVSL add time.
Can a horse recover from equine infectious anemia?
No. The USDA states there is no treatment, and infected horses become lifelong carriers, which is why they must be permanently isolated or euthanized.
Do retired horses need a Coggins test?
The USDA recommends testing every horse once a year, retired or not. Whether the law requires it for a horse that stays home depends on the state: Texas and Florida rules cover boarding stables, Wisconsin's don't, and any trip across a state line needs a current test.
