INTRADERMAL INJECTION

1. Course Introduction

Intradermal injection is an important basic clinical skill that requires precision, appropriate anatomical understanding and strict attention to patient safety and infection prevention. Although the procedure involves a small volume and superficial needle insertion, incorrect needle angle or depth can result in subcutaneous administration and an ineffective or inappropriate procedure.

This course is designed to provide undergraduate MBBS students with a structured, competency-oriented learning experience for understanding and performing intradermal injection.

The course combines multimedia learning with faculty demonstration, simulation-based deliberate practice, peer learning, feedback and Direct Observation of Procedural Skills (DOPS) assessment.

Students will progress from understanding the anatomy and indications to independently demonstrating the complete procedure in a simulated clinical environment.

2. Why This Skill Matters

The intradermal route has specific clinical applications, particularly in diagnostic and selected immunological procedures. Students must understand that this route differs fundamentally from subcutaneous and intramuscular injection.

The skill requires control of:

• Injection site
• Needle orientation
• Bevel position
• Needle angle
• Depth of insertion
• Injected volume
• Expected local response
• Sharps disposal

The course therefore focuses not only on “how to insert the needle”, but on the complete professional workflow from patient identification to documentation.

3. Course Aim

To enable undergraduate medical students to develop the knowledge, technical skills, patient-safety behaviours and professional attitude required to perform an intradermal injection safely and competently in a simulated clinical environment.

4. Learning Objectives

By the end of the course, the student will be able to:

Knowledge

1. Define intradermal injection.
2. Describe the relevant layers of the skin.
3. Identify the dermis as the target anatomical layer.
4. Explain common clinical indications.
5. Identify appropriate equipment.
6. Describe appropriate injection sites and sites to avoid.
7. Explain the principles of needle angle and depth.
8. Recognize an expected wheal/bleb when applicable.
9. Describe common technical errors.
10. Explain sharps and infection-prevention principles.

Practical Skills

The student will be able to:

• Identify the patient correctly.
• Confirm the indication and procedure.
• Explain the procedure appropriately.
• Obtain appropriate consent.
• Perform hand hygiene.
• Prepare equipment safely.
• Select an appropriate site.
• Prepare the skin appropriately.
• Hold the syringe correctly.
• Position the needle bevel up.
• Insert the needle at a shallow angle.
• Place the needle tip within the dermis.
• Administer the prescribed small volume.
• Recognize a wheal/bleb when expected.
• Withdraw the needle safely.
• Dispose of sharps immediately.
• Provide appropriate post-procedure instructions.
• Document the procedure.

Professionalism

Students will demonstrate:

• Respectful communication.
• Patient dignity and privacy.
• Appropriate consent.
• Infection-prevention behaviour.
• Safe handling of sharps.
• Responsibility for complete procedural documentation.

5. Course Content

Module 1 – Understanding Intradermal Injection

Students are introduced to:

• Definition of intradermal injection
• Anatomical layers of skin
• Dermal target
• Difference between intradermal, subcutaneous and intramuscular routes
• Importance of shallow needle insertion

Key takeaway

Intradermal injection = small volume deposited within the dermis.

Module 2 – Indications and Clinical Applications

Students learn about:

• Mantoux/tuberculin skin testing
• Selected diagnostic skin tests
• Selected immunological procedures
• Procedure-specific applications

Emphasis is placed on verifying the correct route for the specific medication, vaccine or diagnostic procedurerather than assuming that any preparation can be administered intradermally.

Module 3 – Equipment and Preparation

Students learn how to prepare:

• Appropriate syringe
• Suitable fine needle
• Prescribed solution/test material
• Antiseptic preparation where indicated
• Gauze/cotton
• PPE where required
• Hand-hygiene supplies
• Sharps container
• Clinical tray

Students are taught to check:

Right patient → Right procedure → Right preparation → Right dose/volume → Right route → Right site

Module 4 – Patient Identification, Communication and Consent

The course emphasizes that procedural competence begins before needle insertion.

Students practise:

• Introducing themselves.
• Confirming patient identity.
• Confirming the intended procedure.
• Explaining the procedure.
• Checking relevant allergies and precautions.
• Obtaining appropriate consent.
• Maintaining privacy and dignity.
• Reassuring the patient.

Module 5 – Infection Prevention

Students learn:

• Appropriate hand hygiene.
• Standard precautions.
• Clean/aseptic preparation of equipment.
• Appropriate skin preparation.
• Avoidance of contaminated equipment or surfaces.
• Appropriate glove use when indicated.
• Prevention of cross-contamination.

Core message

“Never compromise infection prevention for speed.”

Module 6 – Site Selection and Positioning

Students learn to:

• Select an appropriate procedure-specific site.
• Identify healthy, intact skin.
• Position the patient comfortably.
• Support the limb appropriately.
• Maintain privacy.

Areas with infection, inflammation, burns, wounds or other significant skin abnormalities should generally be avoided where they are inappropriate for the specific procedure.

6. Module 7 – The Critical Technical Skill

This is the central practical component of the course.

Students practise the three key principles:

1. BEVEL UP

The needle bevel should face upward.

2. SHALLOW ANGLE

The needle approaches the skin at a shallow angle, almost parallel to the surface.

3. CORRECT DERMAL DEPTH

The needle tip should be positioned within the dermis rather than entering the subcutaneous tissue.

Memory aid

“Bevel Up – Shallow – Dermis.”

Students repeatedly practise this movement using a simulation skin trainer.

7. Module 8 – Injection and Expected Endpoint

Students learn to:

• Inject the prescribed small volume slowly.
• Observe the injection site.
• Recognize a small wheal/bleb when it is the expected endpoint for the particular procedure.
• Avoid unnecessary manipulation of the site.
• Follow procedure-specific post-injection instructions.

Students are reminded that the exact dose, volume and endpoint are procedure-specific and should follow the relevant clinical/product protocol.

8. Module 9 – Safe Completion of the Procedure

Students practise:

• Safe needle withdrawal.
• Immediate sharps disposal.
• Avoiding routine needle recapping.
• Checking patient comfort.
• Giving appropriate instructions.
• Documentation.

Safety principle

“Needle out → Sharps container immediately.”

9. Module 10 – Complete Competency Workflow

Students integrate all components into one continuous clinical procedure:

Identify Patient & Indication
↓
Explain & Obtain Consent
↓
Hand Hygiene & Prepare Equipment
↓
Select Appropriate Site
↓
Prepare Skin
↓
Bevel Up
↓
Shallow Angle
↓
Dermal Placement
↓
Inject Prescribed Small Volume
↓
Observe Expected Wheal/Bleb When Applicable
↓
Withdraw Safely
↓
Dispose of Sharps
↓
Patient Instructions
↓
Document