22,23 In patients with a normal or low-normal serum vitamin B 12 level, complete blood count results demonstrating macrocytosis, or suspected clinical manifestations, a serum methylmalonic acid level is an appropriate next step 1,2,6,18 and is a more direct measure of vitamin B 12 's physiologic activity
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A reticulocyte count may also be checked, as a rise in reticulocytes (young red blood cells) within the first week indicates effective bone marrow response
Decipher the landscape of B12 Shots & Injections, exploring the nuances and essential B12 injection indications for a well-informed approach to supplementation
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For dietary deficiency, the BNF recommends oral cyanocobalamin 50150 micrograms daily