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Ok ...what is your son's age ? Why did he need an EGG? Does he have medical problems? Any troubling symptoms?
What is your question ?
The EGG is a snapshot of the heart's electrical activity. It is a very useful screening tool. A normal EGG is assuring to a point for good heart health but by itself is not absolute assurance of no possible heart related problems
Certain problems might need additional testing ....
I hope that this information is helpful for you
Let me know if you have further questions or concerns
I will be happy to get back with you
Anthony Bray MD