What size needle is recommended for subcutaneous (SC) injections?

The recommended needle size for subcutaneous injections is typically within the range of 25 to 28 gauge, with lengths of either 3/8 or 5/8 inches. This specific gauge allows for a balance between ease of injection and minimal discomfort for the patient. Thinner needles, such as those in the 25 to 28 gauge range, are less likely to cause tissue trauma and can effectively deliver medications into the fatty tissue just beneath the skin.

The shorter needle length of 3/8 or 5/8 inch is generally sufficient for subcutaneous fat, as it ensures that the medication is delivered appropriately without reaching muscle tissue, which is important for the pharmacokinetics of certain drugs. This method is commonly used for administering various vaccines, insulin, and heparin, where subcutaneous delivery is preferred to achieve the desired therapeutic effect while minimizing potential complications.