Sphynx Health Testing & Screening Guide: HCM, DNA Testing & What Buyers Should Know

Sphynx health testing is one of the most important things a kitten buyer can understand before choosing a breeder. The phrase “health tested” can sound reassuring, but it may refer to very different things: cardiac screening of breeding cats, DNA testing, infectious-disease testing, routine veterinary exams, or some combination of these.

This guide explains what each type of screening can—and cannot—tell you, what records a responsible breeder should be able to discuss, and how to separate meaningful health testing from vague marketing claims.

Sphynx Health Testing: The Short Answer

A strong Sphynx health-screening program uses more than one test. HCM is evaluated with echocardiography on breeding cats, DNA testing is used for inherited variants and traits, and FIV/FeLV testing addresses infectious disease risk. A kitten wellness exam is important, but it is not a substitute for documented parent health screening.

For buyers: ask when the parent cats were last HCM scanned, who interpreted the scans, which DNA panel was used, whether breeding cats are FIV/FeLV negative, and what veterinary records come with the kitten.

What “Health Tested” Should Mean for a Sphynx Breeder

A responsible Sphynx breeding program should think about health in layers rather than relying on a single test. No test can guarantee that a cat will never develop disease, and a normal result today does not always predict what will happen years later.

Cardiac screening: echocardiography to evaluate the heart for cardiomyopathy, including hypertrophic cardiomyopathy (HCM).
Genetic screening: DNA panels that identify specific known variants and inherited traits.
Retrovirus testing: FIV and FeLV status, particularly important in breeding and multi-cat environments.
Routine veterinary care: physical exams, vaccinations, deworming, microchipping, and other age-appropriate care for kittens.
Ongoing screening: repeating appropriate testing over time rather than assuming one normal result lasts for life.

HCM Screening in Sphynx Cats

Hypertrophic cardiomyopathy (HCM) is the most common heart disease in cats, and Cornell University includes the Sphynx among breeds in which HCM occurs more commonly. HCM causes abnormal thickening of the heart muscle and can remain silent for a long period before clinical signs appear.

The American College of Veterinary Internal Medicine (ACVIM) identifies echocardiography as the gold-standard test for diagnosing feline cardiomyopathies. ACVIM also lists a pedigree cat intended for breeding as an indication for cardiac evaluation.

An echocardiogram is an ultrasound of the heart. It allows the examiner to assess heart-wall thickness, chamber size, heart function, blood flow, and other findings that cannot be determined from a DNA test alone.

Important: A normal echocardiogram is reassuring, but it is a snapshot in time. HCM can develop later, which is why ongoing screening of active breeding cats is more meaningful than a single lifetime scan.

At Purradox, active breeding cats receive annual HCM echocardiograms performed by a veterinary cardiologist. Our program-level protocol is explained in more detail in our Purradox Health Screening Protocols.

HCM DNA Testing: Useful Information, but Not a Replacement for Echocardiography

DNA testing and cardiac imaging answer different questions. A DNA panel can identify specific genetic variants that a laboratory knows how to test for. An echocardiogram evaluates the cat’s actual heart structure and function at the time of the examination.

This distinction matters in Sphynx cats. Research on the ALMS1 variant proposed in association with Sphynx HCM has produced mixed results. A 2024 New Zealand study found that the ALMS1 variant was not associated with HCM diagnosis in the studied Sphynx population, and a 2026 study in Thailand likewise found no significant association between the variant and echocardiographic HCM findings in that population.

For buyers, the practical takeaway is simple: a breeder should not use a DNA result as proof that a Sphynx cat cannot develop HCM. DNA testing can contribute useful information, but it should not replace cardiac imaging.

What Broader DNA Testing Can Tell a Breeder

Broader feline DNA panels can help breeders evaluate known inherited disease variants, blood type, genetic diversity, color traits, and other inherited characteristics. These results can be useful when planning pairings and avoiding certain high-risk combinations.

However, a result described as “DNA clear” does not mean that the cat is guaranteed to be free of every hereditary or acquired disease. DNA panels only report the variants included in that particular test, and veterinary interpretation remains important.

For a deeper explanation, see our Genetic Testing for Sphynx Cats guide.

FIV and FeLV Testing in Breeding Programs

Feline immunodeficiency virus (FIV) and feline leukemia virus (FeLV) are infectious diseases rather than genetic conditions. Their status is especially important in multi-cat and breeding environments because cats may have close contact during housing and mating.

The American Association of Feline Practitioners (AAFP) recommends that the retrovirus status of cats in breeding catteries be known and discusses repeat testing when cats are newly introduced or when exposure risk changes.

Purradox breeding cats are maintained as FIV/FeLV negative as part of our breeding-program health protocol.

Parent Health Testing vs. Kitten Veterinary Care

One of the most common sources of confusion is assuming that every test performed on breeding cats is also performed on every kitten. These are two different parts of responsible breeding.

Breeding Parents	Kittens Before Placement
HCM echocardiograms	Veterinary wellness examinations
DNA/genetic screening	Age-appropriate vaccinations
FIV/FeLV status	Deworming and parasite management
Ongoing breeding-health evaluation	Microchip and veterinary records
Breeding decisions based on health history	Health certificate and go-home documentation when applicable

At Purradox, the parents undergo the breeding-program screening described above. Kittens receive their own age-appropriate veterinary care before going home, including veterinary exams, vaccinations, deworming, microchipping, spay/neuter according to the applicable program, and veterinary records.

What Health Records Should a Breeder Be Able to Discuss?

A breeder does not need to publish every private veterinary document online to be transparent. They should, however, be able to explain their health-testing program clearly and consistently.

When the kitten’s parents were last screened by echocardiogram.
Who performed the cardiac screening and whether the examiner is experienced in veterinary cardiology.
Whether active breeding cats are screened repeatedly over time.
Which DNA panel is used and what the breeder does with carrier or at-risk results.
The FIV/FeLV status of breeding cats.
What veterinary care the kitten receives before placement.
What happens if a breeding cat later develops an abnormal or equivocal finding.

Questions to Ask Before Buying a Sphynx Kitten

When were the kitten’s parents last screened by echocardiogram?
Who performed those scans?
Do you repeat HCM screening on active breeding cats?
What DNA panel do you use?
How do you interpret carrier or risk results when planning breedings?
Are your breeding cats tested for FIV and FeLV?
What veterinary care does the kitten receive before going home?
What records will I receive with my kitten?
How does your health guarantee address hereditary conditions?
What is your policy if a breeding cat later develops a concerning cardiac finding?

Health-Testing Red Flags

“The parents are DNA clear, so HCM is impossible.” DNA screening does not replace echocardiography.
No dates attached to HCM claims. “HCM scanned” means much less if the scan occurred years ago and was never repeated.
Confusing a general veterinary exam with an echocardiogram. Listening to the heart with a stethoscope is useful, but it is not the same test.
One scan for life. A normal result at one point in time cannot guarantee a cat will remain free of HCM.
Refusing to discuss parental health history. Responsible breeding requires tracking more than a kitten’s immediate exam.
Using “health tested” without explaining what was actually tested.

A Simple Sphynx Breeder Health-Screening Checklist

Want a printable version to use while comparing breeders? Download the free 3-page Purradox Sphynx Breeder Health-Screening Checklist with parent-screening questions, red flags, and a quick decision guide.

Download the Free Health-Screening Checklist

Use this checklist when comparing breeders. It is designed to help you ask better questions—not to guarantee the future health of any individual cat.

☐ Breeding parents receive echocardiograms for HCM screening.
☐ Cardiac screening is repeated while cats remain active in the breeding program.
☐ The breeder can tell you when the parents were last screened.
☐ DNA testing is used as an additional tool rather than a substitute for echocardiography.
☐ FIV/FeLV status of breeding cats is known.
☐ The breeder explains which health tests are performed on parents versus kittens.
☐ Kittens receive veterinary examinations and age-appropriate preventive care.
☐ Veterinary and vaccination records are provided at go-home.
☐ The breeder tracks health findings across generations.
☐ The health guarantee is available for review before purchase.

How Purradox Approaches Health Screening

Purradox uses a layered approach rather than relying on any one test. Our breeding cats undergo annual HCM echocardiograms by a veterinary cardiologist, DNA screening, and FIV/FeLV testing. Kittens receive their own age-appropriate veterinary care before placement.

For the program-specific details, visit Health Screening Protocols: How We Protect Every Purradox Kitten. For a deeper explanation of cardiac disease, see our Sphynx Cat Heart Health Guide.

References & Further Reading

This guide is educational and is not a substitute for veterinary advice. Individual screening recommendations should be made with your veterinarian or veterinary cardiologist based on your cat’s age, history, examination findings, and family history.