I would guess not very worried. Some neurological (and other) tests are for things that are very low probability, but could be serious and benefit from being treated quickly.

Ages ago, I fell and got a mild concussion. A few months after that, I had some odd neurological symptoms. So I went to a neurologist, who did some low-tech neurology in his office, and then sent me for an MRI, which detected nothing unusual or worrisome. The MRI was in case of the very slight chance that I happened to have developed an unrelated but treatable neurological problem after the concussion. Finding nothing, th doctory sent me home with something like "you're now unusually sensitive to bright light. Sunglasses are good."