I looked up the “rack rate” cost of my DNA test in the previous comment and it is between $1500 and $3500 . Although this test concerns only about 45 disorder-related genes, I’m positive the full DNA complement was elucidated and stored somewhere.
Also I would add that it would be foolish for me to refuse the DNA test. Depending on your genetic makeup, various medications will be more or less effective. In some cases the enzyme metabolism is such that a given medication might be totally ineffective. This is something that could only be determined through trial and error in the past.