Of all the tests we take in a lifetime, a soil sample test can prove to be one of the more important ones for gardeners.
The samples are taken from a variety of places around the garden and combined before being taken to your local extension office.
The Kerr Center for Sustainable Agriculture just posted a useful video of exactly what to do to get it right so your results accurately advise you on what to add to your soil to get the garden growing well.
Here's a link to the video - http://kerrcenter.com/video/take-soil-sample-yield-accurate-soil-test/
If you want to grow a garden, a soil test can help a lot so you don't waste fertilizers and even plants that can't grow.