Thanks mrsD. You are a wealth of information, and from what I can see in all the threads I've read, a great help to folks, like me, who have suddenly been slapped in the face and confronting a very difficult situation.

make sure that you stop B12 supplement several days before testing

Thanks for the advice. Does it skew the results? How many days?

I'd do 5-7 days. This will let any oral just taken not show up.

B12 injected will show a huge effect, but oral is less absorbed.
B12 stays in the serum for about 72 hrs when injected.
Injected is 1000mcg all at once. This is why taking oral I think is better, because the injection just doesn't last long. Many doctors are switching to oral recommendations, but it is a slow process for them to do a "new thing".

Your target is 1000 or better on the test if you are supplementing. The test only reads to 2000, and some posters here keep their levels at that reading.

Please remember, it took a while to get to where you are now.

It will take some time to crawl out of it.

We can heal, but it takes time to do so.