What needle length and angle are typically used for an adult subcutaneous injection?

What needle length and angle are typically used for an adult subcutaneous injection?

• A. 1 inch at 90 degrees
• B. 3/8 to 5/8 inch needle at 45°–90°
• C. 5/8 inch at 15°
• D. 1/2 inch at 10°

Answer: (B)

Subcutaneous injections are given into the fatty tissue just beneath the skin, so you want a short needle and an angle that places the medication into that layer, not into muscle. A needle length of 3/8 to 5/8 inch is typically sufficient for adults, and you adjust the angle from about 45° to 90° based on how much subcutaneous tissue is present. If there’s enough tissue or you use a skin pinch, a 90° angle helps ensure delivery into the fat layer; if tissue is thinner, a 45° angle reduces the risk of penetrating muscle. Using a longer needle or an angle that’s too shallow can fail to reach the subcutaneous tissue or, worse, deposit medication intramuscularly.

Subcutaneous injections are given into the fatty tissue just beneath the skin, so you want a short needle and an angle that places the medication into that layer, not into muscle. A needle length of 3/8 to 5/8 inch is typically sufficient for adults, and you adjust the angle from about 45° to 90° based on how much subcutaneous tissue is present. If there’s enough tissue or you use a skin pinch, a 90° angle helps ensure delivery into the fat layer; if tissue is thinner, a 45° angle reduces the risk of penetrating muscle. Using a longer needle or an angle that’s too shallow can fail to reach the subcutaneous tissue or, worse, deposit medication intramuscularly.