Health Testing, Explained
HCM, SMA, PKDef — what they mean and why every parent should be cleared.
Three genetic conditions are routinely screened in responsibly bred Maine Coons: HCM, SMA, and PKDef. Understanding what each one is — and what 'N/N cleared' means — is essential for any family preparing to reserve a kitten.
HCM, or hypertrophic cardiomyopathy, is a thickening of the heart muscle. It is the most serious inheritable condition in the breed and can shorten life dramatically. A genetic test screens for a known MyBPC3 mutation; an echocardiogram screens the heart structurally. Responsible breeders do both, and re-screen breeding adults annually or biannually.
SMA, or spinal muscular atrophy, causes progressive weakness in the rear legs. It is non-painful but reduces quality of life. A simple genetic test identifies carriers and affected cats. N/N parents cannot produce an affected kitten.
PKDef, or pyruvate kinase deficiency, is an inherited form of anemia. It is also identified by genetic testing and easily avoided when both parents are N/N.
An N/N result means the cat carries two copies of the normal gene and cannot pass the affected version on. Pairing two N/N parents guarantees that no kitten in the litter can inherit the condition genetically. This is the standard at Ironmane Coons — both parents in every pairing are N/N cleared, and the testing certificates are shared with reserved families.
Health testing is not a marketing claim; it is a paper trail. Any breeder advertising health-tested cats should be able to email you the lab certificates within minutes of the request. If they cannot, the testing did not happen.
Begin with our Health & Genetics page, meet the kings and queens, review our upcoming pairings, and — when you are ready — join the Priority Waitlist.