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2012 Aug;17(8):799-804

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IM needle selection depends on the site and body composition, and a qualified clinician should demonstrate IM technique. What role does injection-site rotation play

The health risks are too high to be negligent

You're creating a stable, low-energy environment where the solution remains as close to its original state as possible for as long as possible

Other methods for detection of the absorbed amount of an administered dose of radioactive B12 have been employed, such as estimating the amount of radioactivity excreted with feces