There is no DNA test that I know of for Cipro damage.

Here is the fluoroquinolone post on my thread about drugs that damage people:

http://neurotalk.psychcentral.com/post661103-2.html

There are some links on it that explain further. And since that post was made in 2010, there must be newer information.

Dr. J. Cohen remains the front runner in explaining damage from fluoroquinolone antibiotics.

And a "normal" result for magnesium is rather useless. That test of the serum is only medically useful for very very low levels or very very high levels. A "normal" does not mean you have enough magnesium in your cells.

Here is my magnesium thread:
http://neurotalk.psychcentral.com/thread1138.html

This is explained on the net in many places by many other experts than little old me.
Here is one example that is quite easy to understand.

http://www.easy-immune-health.com/magnesium-level.html