Copper test

My blood work results the neurologist ordered came back today and my copper level is 76. Everything I read online says that is normal but my neurologist messaged me and said it is slightly low and I should take a supplement. Now I’m wondering could that be the cause of my symptoms (mainly spasticity in my legs for 2.5 years but I’ve had other symptoms on and off for 4 years). Has anyone else had this test and were your levels normal or low?