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The thread on tests for PA and B12 deficiency mentions other tests that can help to diagnose PA eg gastrin test and others (link in my other reply) When you were tested for coeliac disease

Main outcome measures : Participation in the complete audit cycle, comparison of actual use of vitamin B-12 injections with agreed criteria of use , and assessment of improvement in use

To determine intracellular NAD + levels approximately 15 mg of tissue was homogenized in 10% trichloroacetic acid (TCA)

So if a healthy person stops taking in vitamin B12, it often takes a few years before the body runs out of it and develops symptoms