Buying and administering your own DNA test isn't difficult at all. You can even go to your local pharmacy and purchase a test kit for a cheap price. When you're buying the kit, you want to know what you're using it for. If it's for your personal information, you won't need any other parties to be involved. If it is for legal reasons, you'll need a witness and have to follow other rules.
A home DNA testing kit is easier to come across than you may think. Your local Wal-Mart, CVS, Rite Aid, Walgreens and many more stores all carry kits. Prices can range anywhere from less than a hundred dollars to several hundred dollars. The test itself may be as little as $30, but then you'll have to pay a laboratory fee that is usually around $100. You'll administer the test, package your items according to the kit's directions, and send them to the laboratory that has a contract with the product. Expect to get your result within three to five business days.
The Genetic Testing Laboratories
You can go to The Genetic Testing Laboratories' website (link below) and order a DNA test that fits your needs. You will find more testing-kit options than you would find at your local pharmacy. It provide tests for reasons such as ancestral origin, siblingship, missing parents and many more. It offers both informational and legal DNA testing, and all tests and results are delivered confidentially via FedEx.
Genetica DNA Laboratories
This is one of the first commercial DNA testing companies in the country, providing quality testing to health-care professionals, embassies and private individuals around the world. You can go to its website (link below) and order from a selection of many different tests. It also offers consultation if you call in. You'll find twin zygosity tests as well as grandparentage tests for a few hundred dollars. It also offers a 48-hour turnaround on its parentage tests.