Hello-

New to this forum and just starting testing due to numbness/tingling in both feet moving into ankles, severe muscle titching moving from lower legs to thigh, now to upper arm and eye lid. Several days ago my lips and tongue started the tingling/numbness. Will be having a nerve conduction study in 2 weeks but have a question on b12 testing. I have been taking otc b12 (5000 mcg) daily along with mulitB and folic acid. How long should I wait after stopping these vitimins to be tested for b12 deficiency?

Thanks-