Does a clear genetic test guarantee a healthy Maine Coon?

No. A genetic result applies to the particular variant or variants tested; it is not a guarantee that the cat is free from every disease or will remain healthy throughout life. For example, veterinary cardiology guidance notes that Maine Coons without the known tested HCM mutation can still develop hypertrophic cardiomyopathy. Ask what a test covers, which animal was tested and how the result fits with other screening and veterinary examinations. Keep copies of documents and let your vet interpret them in context.

Avoid accepting a broad phrase such as genetically clear without the actual report. Screening can provide useful information for responsible decisions, but it does not remove the need for ongoing care. If symptoms occur, seek assessment regardless of an earlier result rather than assuming the test has ruled out every possible explanation. Ask for the laboratory report identifying the test, result and cat; paperwork for a relative is not automatically a test result for the kitten you are buying.