Intradermal Anesthesia Sensitivity Test Volume
For intradermal skin testing of local anesthetics, inject 0.02 mL to produce a 3-5 mm baseline bleb. 1
Specific Technique for Intradermal Testing
The proper technique for intradermal anesthetic testing requires precise volume control 1:
- Draw up 0.05-0.07 mL initially into the syringe, then expel excess fluid and air bubbles to obtain exactly 0.02 mL 1
- Inject the 0.02 mL volume to produce a baseline wheal measuring 3-5 mm in diameter 1
- This standardized approach ensures the most reproducible results for antibiotic and anesthetic intradermal skin testing 1
Interpretation Criteria
A positive intradermal test is defined as: 1
- Wheal size ≥3 mm greater than the negative control (saline)
- Accompanied by a flare ≥5 mm in diameter
- These criteria apply to both prick/puncture and intradermal testing methods 1
Essential Testing Requirements
Before performing intradermal testing, you must 1:
- Apply full-strength reagents by prick/puncture technique first
- Only proceed to intradermal testing if prick test results are negative
- Always place appropriate positive (histamine) and negative (saline) controls
- Ensure controls test positive and negative respectively for results to be valid 1
Safety Considerations
Personnel performing intradermal anesthetic testing must be: 1
- Trained and skilled in application and interpretation of skin testing
- Prepared to treat very rare anaphylaxis (occurs in <2% of skin test-positive patients) 1
The 0.02 mL volume is significantly smaller than volumes used for therapeutic local infiltration (typically 0.25-0.5 mL for intradermal anesthesia) 2, 3, 4, as the purpose is diagnostic testing rather than achieving anesthesia.