Angle of insertion of needle for subcutaneous injection should be:

IGNOU PB Bsc Entrance-2022

Nursing Foundation

Easy

Appeared in: IGNOU PB Bsc Entrance-2022

Explanation

The standard angle for a subcutaneous injection is 45 degrees, which ensures medication is delivered into the adipose (fat) tissue below the skin.
This angle is specifically recommended when about 1 inch (2.5 cm) of skin can be pinched, a common scenario in many patients.
Using a 45-degree angle prevents the needle from penetrating too deeply and entering the underlying muscle, which would alter the medication's absorption rate.
It is the classic, most frequently taught angle for general subcutaneous administration, making it the best answer in a standard test question context.

Option A: A 15-degree angle is too shallow for a subcutaneous injection and would result in an intradermal injection.
Option B: A 25-degree angle is not a standard angle for subcutaneous injections.
Option D: While a 90-degree angle can be used for subcutaneous injections in specific cases, 45 degrees is the more traditional and broadly applicable standard. The 90-degree angle is primarily the standard for intramuscular injections.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Parenteral Medication Administration: Subcutaneous Injection Technique as background academic context rather than a clinical decision trigger.
Selecting the correct injection angle is critical for proper medication absorption and patient safety. Injecting into the wrong tissue layer can cause adverse effects, such as rapid hypoglycemia if insulin is given intramuscularly.
A key nursing responsibility is to assess the patient's body mass and subcutaneous tissue depth before each injection to choose the appropriate needle length and angle (45° vs. 90°).
Systematic rotation of injection sites (e.g., on the abdomen, thighs, arms) is essential to prevent lipohypertrophy (thickening of fat tissue), which can impair drug absorption.

How to Approach the Question

Identify the keyword 'subcutaneous injection' and the question about the 'angle of insertion'.
Recall the standard angles for the main parenteral injection routes: Intradermal (ID), Subcutaneous (SC), and Intramuscular (IM).
Associate ID with a very shallow angle (10-15°), IM with a straight-in angle (90°), and SC with either a 45° or 90° angle.
Evaluate the options. Both 45° and 90° are provided. The question asks for a single best answer without specifying patient size or needle length.
Recognize that 45° is the classic, universally taught angle for a standard subcutaneous injection to avoid muscle, making it the most appropriate general answer. The 90° angle is a correct alternative but depends on specific conditions.

Concept Tested & Keywords

Concept Tested: Parenteral Medication Administration: Subcutaneous Injection Technique
Stem keywords: subcutaneous injection, angle of insertion, needle
Lead-in keywords: should be
Negative lead-in flag: false

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