My Neurologist had me do the NutrEval test where your urine is tested for vitamin and minerals, etc. My B12 has been as high as 1900 when doing a blood test at my regular doctor. The report came back for the NutrEval and it shows a B12 of 12. So obviously I’m not absorbing it, but is this number even possible? I have read many of Mrs. D’s posts and that is what prompted me to ask for more tests. I don’t see the Neurologist for another week. My question is first if this number is possible and secondly, if a person isn’t absorbing vitamin b12, will they absorb a supplement or do they need injections?

i dont know if that number is possible or not. i would have it retested before i would accept a 12. labs have made errors with my blood tests before. .... if you take 5000 mcg of methylcobalamin b12 a day, that should be as good as getting shots. if your nunmbers are really that low, i would get the shots and then continue on taking it orally when the shots stop.

Reference ranges for blood serum will most likely not be the same for urine tests.
It's important to know the lab's reference ranges. Many labs doing the urine test provide a pretty good report on the results. Did you get a copy of the results/report?

Were you taking any supplements when your blood was tested. If so, that could show a falsely elevated blood serum level.

Maybe even a typo or a different measurement...

Are the units in which the two Vitamin B12 measurements are expressed the same?

If they differ by a factor of 100 they could be comparable. It is like expressing a distance measurement in metres or centimetres - 1 metre is the same as 100 centimetres.

In the report, my vitamin D is 56 which is pretty consistent with what my blood work always shows, so it wouldn’t appear they are using a different measurement unit. It just seems odd that I have blood tests of 1900 without supplements and then the urine test comes back at 12. The report concluded that I’m of course deficient, but only mentions the number once. It would seem to me like it must be a mistake.