A friend went for a regular check up following a heart attack a few years ago. During the course of the follow up with the nurse he was asked about tingling in his fingers and his energy levels. Answer about tingling was yes and the answer to energy levels was that he struggles ... and the response from the nurse was to tell him to get the doctor to check his B12 levels.
I've been on at him for a long time to get his B12 levels checked but he's a stubborn cuss and always says that he's on enough medication but may be this will actually get him to get his levels checked. Whether it means his doctor knows how to interpret the test when it comes back is another matter but at least it was something pro-active from a medical professional in relation to B12.