My neuro ordered the same thing and he was looking for blood clots or something like that. Basically they can get stuck somewhere and you can be fine for years and then suddenly something lets them loose and then trouble starts.
For me I think he thought that when I initially hit my head it might have caused something that would come up later to haunt me. It is nice to know there just isn't that problem waiting to happen I have enough already!

Good Luck
Margarite