Originally Posted by mrsD

Nothing in medicine is 100% accurate or perfect.

Gosh, even the testing can be flawed itself. The calibration of the instruments may use old "knowns" and end up messed up completely. Quest had TWO episodes of wrongly calibrated Vit D testings in the past. One was not discovered for an entire year...so all of those tests were inaccurate!

There are far more people missed who have low B12, (ignored even) than who have an elevation pointing to a cancer or kidney failure. The chem screens on the blood would reveal kidney, and liver problems, and CBCs would show aberrations for anemia or whatever. So the high B12 would only be another test, which often is not used anyway.