Laboratory interference: Persistent unexplained elevation may reflect macro-B12 (immunoglobulin-bound B12) or other assay interferences
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Even considering all of these factors you need to understand that checking vitamin B12 levels in the serum still isnt the best way to evaluate for B12 deficiency
Injection Administration: The injection is administered intramuscularly, typically in the arm, thigh, or buttocks
Also, in the case of EPI (exocrine pancreatic insufficiency), a dog will need additional supplements, such as intrinsic factors and probiotics.
The difference between 0.9% and 0.4% is the difference between 28-day preservation and 7-day preservation, and only the assay number tells the story