This "dead space" is typically 0.02 to 0.08 ml depending on the needle
Once B12 deficiency is confirmed, the doctor will want to know why someone has B12 deficiency
Gastrointestinal Disorders: Conditions like Crohn's disease, celiac disease, or a history of weight-loss surgery (like gastric bypass) can damage the exact parts of the intestine that are in charge of B12 absorption

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Counteracted/attenuated were neuroleptics (i.e., catalepsy) [68,70], L-arginine (i.e., prolonged miosis) [86], N(G)-nitro-L-arginine methyl ester (L-NAME) (prolonged miosis, catalepsy) [70,86], and alcohol acute and chronic intoxication [63,64]
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