Injection Sites and Techniques for Hydroxycobalamin Administration

Recommended Injection Sites

The Centers for Disease Control and Prevention recommends the deltoid muscle of the upper arm as the preferred site for routine intramuscular injections in adults, including hydroxycobalamin, using a 1-1½ inch, 22-25 gauge needle 1, 2
For children, the deltoid muscle can be used if muscle mass is adequate, with a needle size ranging from 22-25 gauge and 7/8 to 1¼ inches, based on the size of the muscle 1, 2
The anterolateral thigh is recommended for infants and young children, as well as for toddlers with insufficient deltoid mass, using a 7/8-1 inch, 22-25 gauge needle 1, 2

The Centers for Disease Control and Prevention recommends inserting the needle at a 90-degree angle for intramuscular injections, with the needle long enough to reach the muscle mass but not so long as to involve underlying nerves, blood vessels, or bone 1, 2
Before injecting, pulling back on the plunger to check for blood return is recommended; if blood appears, withdrawing and selecting a new site is advised 4, 5

The Centers for Disease Control and Prevention advises against using the buttock routinely for injections due to potential risk of injury to the sciatic nerve, and because buttock injections have been associated with decreased immunogenicity of certain vaccines 2, 4
Areas with lipohypertrophy or other tissue abnormalities should be avoided for injections 6

Proper site rotation is essential to prevent tissue damage in patients requiring frequent injections, as recommended by the Mayo Clinic 6