How much attention should we pay to the B12 blood test levels? Mine was at 230(200-900) so The doctor had me start self injections twice a week. After two months, we checked the levels again. Now I am at 2500. I wasn't taking nearly the amount some people here are taking, so are your levels that much higher also? Or do you even keep testing? If we ignore the tests when they are high, but are concerned about them when they are low, that doesn't sound logical.