question: My Creatinine level has gone from 1.4 to 1.6 in 5 weeks. BUN to creatine ratio is low.BUN is within range. However I have been on lithium and my lithium level went from 0.4 to 1.1 in the same 5 weeks. My question is does this seem lithium related? Perhaps my kidneys were having trouble filtering the lithium and creatinine along with it. Is this feasible? Thanks