That is the most interesting reference range I've seen for B12... so I am just confused!

I was 294 (150-1100) as range. They typically say anything under 400 is suspect for problems, and many of us who have had B12 problems aim for a level of about 1000.

But, no matter the confusion of range, I'm happy to hear you are taking 1000mcg daily. I'd stay with that....forever!