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Most adolescents and adults will require a 1- to 1.5-inch (25–38 mm) needle to ensure intramuscular administration. Vaccines must reach the desired tissue to provide an optimal immune response and reduce the likelihood of injection-site reactions.
The right needle size for your injections depends on how much medication you need, your body size, and whether the drug has to go into a muscle or under the skin. Your syringe also has to be big enough to hold the right dose, but not so big that it makes measuring small amounts difficult.
The most common needle size for IM injections is between 22G to 25G in width and 1 inch to 1.5 inches in length. The needle needs to be long enough to reach the muscle and wide enough to draw up and deliver the medication.
For SQ (subcutaneous) injections you would typically use a 25 to 27 gauge needle 3/8 to 5/8 inches long for adults and children alike. Some newer medications such as Byetta for diabetes recommends using 30 or 31 gauge 1/3 inch needles which are ultra fine.
Needle selection should be based on the: • Route • Age • Gender and weight for adults (19 years and older) • Injection site The following table outlines recommended needle gauges and lengths. In addition, clinical judgment should be used when selecting needles to administer injectable vaccines.
Men, 70–118 kg (152–260 lbs) 1.5 in (38 mm) Men, greater than 118 kg (>260 lbs) Women, Women, greater than 70–90 kg (152–200 lbs) 90 kg (>200 lbs) *Some experts recommend a 5/8-inch needle for men and women who weigh less than 60 kg (130 lbs). If used, the skin must be stretched fully and the subcutaneous tissues must not be bunched. 2.
A needle length of 1 to 1.5 inches is generally recommended for adults. This length is sufficient to bypass the subcutaneous layer and deliver the B12 directly into the muscle. The RELI® Conventional Hypodermic Needle with Pre-attached Luer Lock Syringe is crafted for optimal performance and safety in medical procedures.
5 Alternate needle lengths may be used if the skin is stretched tightly and subcutaneous tissues are not bunched, as follows: a) a ⅝" needle in toddlers, children, and patients weighing less than 130 lbs (less than 60 kg) for IM injection in the deltoid muscle only, or b) a 1" needle for administration in the thigh
For infants (1–12 months): Inject at a 45-degree angle into fatty tissue overlying the anterolateral thigh muscle — use 5/8" needle, 23–25 gauge. For children and teens (1–18 years): Inject at a 45-degree angle into fatty tissue overlying the triceps or anterolateral thigh muscle — use 5/8" needle, 23–25 gauge.
Longer needles (1⁄2 inch or longer) are commonly used for intramuscular injections, while shorter (shorter than 1⁄2 inch) needles are more often used for intravenous injections. Different sized needles are used for different purposes.