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What gauge and length needle should be used for an intramuscular vitamin B12 injection in an adult?
This is simply salt mixed in sterile water in a concentration of 0.9%
For suspected macro-B12, precipitation with PEG is the test most often reached for, though it is nonspecific and can remove B12 that is fully available to cells, so direct measurement of the binding proteins, haptocorrin and transcobalamin, may be more informative when it is available
[1] These effects are typically dose-dependent, most pronounced during dose escalation, and tend to diminish over time
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