Anthony,

I would not stop the B12 based on your RBC. IMO, your B12 at 380 is in the lower range so I would continue. Regarding blood counts, it's best not to rely on just one test and only one aspect of your CBC. That small rise could easily be attributed to how much or how little you hydrated before your test. If you are dehydrated then there is usually a higher concentration of RBCs when they check. Your doc would be looking at the CBC results and any symptoms you are having versus just a lab result. If you are concerned, then have them check again and watch for trends.

Also, it's best to stop your B12 supplements a few days prior to testing otherwise your B12 serum result could be falsely elevated.