My doctor recommended trying B12 injections, which I would like to start, but I would like to know my B12 and Folate levels before I begin. I feel very confused about my laboratory findings. Before supplementing with B vitamins, my B12 levels were always low normal (400-500 range). After I started supplementing, my labs were consistently off the charts high (1,700-1,900). I stopped taking B complex and Levocarnitine on December 18, 2014 and would like to redo my labs after some time has passed. I am also considering a lumbar puncture. I know a LP is invasive, but I am feeling quite desperate. Of course, I will consult with my neurologist first. If she agrees to the LP, what should I request beyond measuring B12 and Folate CSF levels?