would you do a DNA test on your child?

To have a clear conscience and answer the doubt, then DNA would be the best option. If the person involved that there is no possibility of having a child to somebody. Some people do it, that's a good thing we have the updated available technology to solve any unpredictable circumstances. Nowadays, it is also one common method to solve crimes and find the real culprit of losing life of the victims.

I don't think there is any need for that. I am sure the wife only said that to spite you. But 15 years is 15 years and the love that you have felt for this child can never be measured by any DNA test.

Yes, I would do so - only for the reason that my wife was shouting at me. That is, if I were a husband. I would also go for marriage counseling and ask that my wife also attend the marriage counseling sessions. I would want my relationship with my wife and my child to be based on truth. Truth will not change the fact that I would still love that child. But if my wife is shouting that the child is not mine, then we need to deal with the root of the problem in order to solve some deep issues. If my wife is shouting out loud, then probably the child has heard her shouting and therefore, the child now needs to know the truth. If she had kept her emotions in check and her mouth shut, then there would no need to do a DNA test. But she let the 'cat out of the bag' and now, we need to face and deal with this situation.