Comparative performance of five commercial prick skin test devices

Area of Science:

• Allergy and Immunology
• Dermatology
• Medical Device Evaluation

Background:

• Skin prick testing is a common diagnostic tool for allergies.
• Device selection can influence test reproducibility and interpretation.
• Standardization of skin prick testing is crucial for accurate allergy diagnosis.

Purpose of the Study:

• To compare the performance of five commercial skin prick test devices.
• To evaluate device reproducibility, patient acceptance, and false-negative rates.
• To determine device-specific wheal sizes for reliable allergen testing.

Main Methods:

• Comparison of five skin prick test devices: Hollister-Stier, ALK Laboratories, bifurcated needle (prick/puncture), Multi-Test, and DermaPIK.
• Assessment of reproducibility using histamine base (10 mg/ml).
• Evaluation of skin trauma, patient acceptance, and reaction sizes at control sites.

Main Results:

• All devices showed similar reproducibility with histamine.
• Skin trauma varied significantly, with Multi-Test and DermaPIK being most traumatic.
• More traumatic devices led to larger control site reactions and lower patient acceptance.
• Different minimum wheal sizes are proposed for 99% specificity for each device.

Conclusions:

• Device-induced skin trauma influences skin prick test results and interpretation.
• Specific wheal size thresholds are recommended for each device to ensure diagnostic accuracy.
• Allergen testing interpretation must account for device-specific characteristics and potential for false negatives.