Final answer:
The angle for a subcutaneous injection is usually either 45 degrees or 90 degrees, chosen based on the patient's body tissue and the needle length.
Step-by-step explanation:
The angle for a subcutaneous injection is commonly 45 degrees or 90 degrees, depending on the specific circumstances such as the amount of subcutaneous tissue and the length of the needle. For a standard subcutaneous injection, a 45-degree angle is often used if the patient has average body tissue and the needle length is adequate to ensure medication is delivered to the subcutaneous layer. However, if the needle is shorter or the patient has less subcutaneous tissue, a 90-degree angle may be employed to administer the injection directly into the subcutaneous tissue.