Someone is going to have to extract gDNA from whatever sample you provide, saliva or blood usually. Then you need to perform a search for various genes or SNPs

Someone is going to have to extract gDNA from whatever sample you provide, saliva or blood usually. Then you need to perform a search for various genes or SNPs. There are a few different assays to do this, but most require molecular biology reagents and special equipment. You may even need to do some sequencing. All of these services are provided by private companies but you can't be sure of the fate of your genetic information. Doing it yourself is possible but would cost a few grand for bare essentials.