Forgot to say, he categorically said shortness of breath wasn't a factor on B12 deficiency ---- but I'm sure it's a major symptom, mentioned on every website I've read. Trouble is I've read so much and with fog brain not sure how logically I'm storing the info!
When I first got diagnosed I was reading through this list and got to 'the sighs'. "That's you! That's definitely you. And it's so annoying!" - was the immediate response.
If the lab uses a relatively modern (about 25 years old) anti-IF test then you're probably better off stopping the patches for a few days. If they use the very modern test then it's not affected at all.
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