*We are not mathematicians. Probability Analysis was determined using probability of multiple independent events. Published statistics were not readily available or known for the outcome of DNA testing for NARC and CNM: We assumed a 5% carrier/affected rate, actual data could be much larger, or slightly smaller. Published statistics are not readily available or known for the outcomes for Breed Identification DNA Tests of Registered Labrador Retrievers. We used our own sample of AKC Registered Labrador Retrievers, which is much smaller than a market study would require to determine accuracy and reliability.