Coggins Test: What It Is, Cost, Validity by State (2026 Guide)

By Brian Bickell, who raises paint and quarter horses at Bickell Ranches in Stillwater, Oklahoma.

If you've owned a horse for more than a month, someone has asked you for your Coggins. The vet needs one before they'll board your horse. The show secretary needs one at check-in. The state inspector needs one if you're hauling across state lines.

But a surprising number of horse owners don't actually know what a Coggins test is — just that they need one and it's probably somewhere in the glovebox.

Educational, not veterinary or legal advice. This is a plain-English walkthrough for horse owners. Rules change by state and your vet is the right call on anything clinical.

What Is a Coggins Test?

A Coggins test is a blood test that screens for Equine Infectious Anemia (EIA), a viral disease with no vaccine and no cure. The test is named after Dr. Leroy Coggins, who developed it in 1970.

EIA is caused by a retrovirus in the same family as HIV. It attacks a horse's immune system, destroying red blood cells and causing recurring fevers, weight loss, swelling, and anemia. Infected horses are carriers for life.

The scary part: many infected horses show no symptoms at all. They look perfectly healthy but can spread the virus to every horse around them. That's why testing matters. You can't tell by looking.

How It Spreads

EIA spreads primarily through blood transfer:

• Biting flies (horseflies and deerflies) — the most common route. A fly bites an infected horse, then bites your horse within minutes.
• Contaminated needles or equipment — shared syringes, dental floats, surgical tools
• Blood transfusions
• In utero — an infected mare can pass it to her foal
• Natural breeding (less common)

It does not spread through casual contact, shared water buckets, grooming, or being in the same pasture (absent biting flies).

How the Test Works

Your veterinarian draws blood from your horse's jugular vein and sends it to a USDA-approved lab. There are two testing methods:

• AGID (Agar Gel Immunodiffusion) — the original Coggins test. Lab processing takes about 24 hours, but total turnaround is typically 3–5 business days once you factor in shipping to and from the lab. This is the gold standard and the confirmatory test if an initial screen comes back positive.
• ELISA (Enzyme-Linked Immunosorbent Assay) — faster (results possible within an hour at labs with point-of-care kits), but can produce false positives. A positive ELISA always requires an AGID to confirm.

Both tests look for antibodies to the EIA virus, not the virus itself. If your horse has antibodies, it means they've been infected.

The test must be performed by a USDA Category II Accredited Veterinarian. Your regular vet almost certainly qualifies.

Cost and Turnaround

Expect to pay $20–$70 depending on your region, the testing method, and your vet's office visit fee. University diagnostic labs can be cheaper. Texas A&M, for example, charges about $9 for the lab fee alone.

Turnaround is typically 3–5 business days, depending on whether your vet's office has point-of-care testing or ships to an outside lab. Rush processing is sometimes available for an extra fee.

The USDA APHIS reports roughly 1.3 million horses tested annually in the U.S. The positive rate is extremely low (typically well under 200 cases per year nationwide), but each positive case triggers quarantine of the entire exposed herd. (Check the USDA APHIS EIA quarterly reports for the most current numbers.)

When Do You Need a Coggins?

Short answer: almost anytime your horse goes anywhere or interacts with other horses.

Interstate travel — All 50 states require a negative Coggins for any horse crossing state lines. No exceptions. See our complete guide to interstate horse transport documents for the full breakdown.

Horse shows, competitions, rodeos — Nearly universally required. Many states mandate it by law, and virtually every show organizer requires it at check-in.

Sales and auctions — Required at all auction markets and for private sales in most states. A current Coggins protects both buyer and seller. If you're buying or selling a horse, it's one of the essential documents.

Boarding at a new facility — Most boarding barns require a current negative Coggins before they'll let your horse on the property. This protects every horse in the barn.

Breeding — Many breeding farms require current Coggins before accepting mares or stallions.

Trail riding on public land — Many state parks and national forests require proof of a negative Coggins for horses on the trail.

Annual compliance — Many states require annual testing even if your horse never leaves home. It's a disease surveillance measure — your vet may bundle it with your horse's annual wellness visit.

How Long Is a Coggins Valid?

This is where it gets complicated, because the destination state's rules govern, not your home state's.

If you're hauling to a show or moving a horse, always check the rules for where you're going, not where you are.

Tip: A Coggins, health certificates, and vaccination records are the kind of documents you need on-demand at a venue gate or a highway checkpoint. HorseBook lets you scan and store them on your phone — filed under your horse's profile, accessible in seconds, no glove compartment archaeology required.

State-by-State Coggins Validity

The vast majority of states follow the federal baseline of 12 months from the blood draw date. Here are the states with notable differences or additional requirements:

State	Validity Period	Notes
Most states	12 months	Federal baseline (USDA APHIS)
California	6 months	For horses entering the state
Hawaii	90 days	Plus a retest 45–60 days after arrival at a Hawaii State Veterinary Laboratory; horse isolated until post-arrival test clears
Kansas	12 months	Added new exhibition requirement in January 2025

Important Notes

• If your Coggins expires while you're traveling, your health certificate (CVI) becomes invalid too, even if the health certificate itself hasn't expired yet.
• Individual states can and do change their requirements. Always verify with the destination state's Department of Agriculture before traveling. A Google result from 2023 may not reflect current rules.
• Some states have additional requirements for horses entering from states with recent EIA cases. During active outbreaks, requirements can tighten on short notice.

What's on the Coggins Form?

The official USDA form is called VS Form 10-11. It contains:

• Horse identification — registered name, breed, color, age or date of birth, sex, microchip or tattoo number
• Markings documentation — a written description of all permanent white markings, brands, tattoos, scars, and whorls. Blank is not acceptable — if there are no markings, the vet writes "NONE." Digital versions include photographs instead of hand drawings.
• Owner information — name, address, phone, county
• Veterinarian information — name, license number, signature
• Lab results — test type (AGID or ELISA), result, accession number, lab technician signature

This is why a Coggins doubles as an identification document. The detailed physical description and photograph help verify that the horse in front of an inspector is the same horse that tested negative.

Digital vs. Paper Coggins

The traditional Coggins is a paper form with hand-drawn markings diagrams. It works, but it can be lost, water-damaged, or left at home when you need it most.

Digital Coggins, issued through platforms like GlobalVetLink, are legally accepted in all 50 states. They include photographs (better identification than hand drawings), are accessible through an online portal, can't be lost, and automatically link to electronic health certificates. That said, some inspectors at highway checkpoints may still prefer to see a paper original, so carry one if you have it.

Digital is increasingly preferred by show organizers and state inspectors because photographs provide better horse identification than hand sketches.

Paper is still valid everywhere. If your vet issues a paper form, it's perfectly legal. Just don't lose it.

Keeping Your Coggins Accessible

This is one of those problems that sounds minor until you're standing at a venue gate at 6 AM and your Coggins is in a binder on your kitchen counter.

Options for keeping it accessible:

• Photograph it and keep the photo on your phone
• Use a digital Coggins service (GlobalVetLink/MyVetLink)
• Store it in a horse record app like HorseBook — scan the document and it's always on your phone, filed with your horse's other records

The best approach is to have both a physical copy in your trailer's document folder and a digital backup on your phone.

What Happens If Your Horse Tests Positive?

This is the outcome every horse owner dreads, and there's no way to soften it.

EIA has no cure. An infected horse is a carrier for life.

A positive test is a reportable disease in all states. The lab is required to notify state and federal animal health authorities. You don't get to keep this private.

There are three options for a confirmed positive horse:

1. Lifetime quarantine — The horse is permanently branded or tattooed for identification and must be kept at least 200 yards from any EIA-negative horse for the rest of its life. It can never travel, compete, or board with other horses again.

2. Euthanasia — Often recommended given the severe quality-of-life constraints of permanent quarantine. This is an agonizing decision, but it's the most common outcome.

3. Donation to a federally approved research facility.

All horses that were housed with or near the positive horse ("exposed horses") must be retested every 30–60 days until no new positives are found.

The positive rate is very low, but it's not zero, and the consequences are devastating. That's why testing is mandatory: it protects every horse, not just yours.

Common Questions

My horse never leaves the property. Do I still need a Coggins?

Probably. Many states require annual testing even for homebodies. And "never leaves" isn't the same as "never exposed" — horseflies can carry the virus from neighboring properties. Your vet can advise on your state's specific requirements.

Do foals need a Coggins?

Most states exempt nursing foals under 6 months if they're accompanied by a dam with a current negative Coggins. Some states extend this exemption to 12 months. Check your state's specific rules — your vet will know.

I lost my Coggins paperwork. Now what?

Don't panic. Your vet and the testing laboratory both keep copies. Call either one and request a duplicate. If your Coggins was issued digitally through GlobalVetLink, log in to MyVetLink and it's right there. Better yet — scan a copy into a horse record app like HorseBook so you always have a backup on your phone.

Do mules and donkeys need Coggins?

Yes. EIA affects all equids: horses, ponies, mules, donkeys, and even zebras. Same rules apply.

My Coggins expired and I'm at a checkpoint. What happens?

The horse can be denied entry, turned back, and potentially quarantined at your expense until a new test is obtained. In some states, fines apply. This is one of the most common (and most preventable) headaches in horse ownership.

The Bottom Line

A Coggins test is one of those things that feels like busywork until you understand what it's protecting against. EIA is rare because of mandatory testing. Without it, the disease would spread silently through the entire horse population.

Get your horse tested annually. Keep the paperwork (or a digital copy) where you can actually find it. Check your destination state's requirements before you travel.

It's 15 minutes with the vet and $40. That's cheap insurance for peace of mind. HorseBook makes sure you'll always know where to find it.

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Brian Bickell is the founder of HorseBook and raises paint and quarter horses at Bickell Ranches in Stillwater, Oklahoma. He built HorseBook because he got tired of digging through gloveboxes for Coggins papers.