Skin Prick Testing (SPT) or Prick skin testing (PST), is a widely used, high quality, low-risk allergy test to demonstrate immediate IgE-mediated allergy. The test is cost effective. only a trained person can perform the test.
Following are the relative contraindication of performing allergy skin testing.
No age is bar to do the test. However in infants and in elderly patients, reactions are often diminished. Therefore making the interpretation of the test difficult.
In infants skin test often shows large flare response and smaller wheals.
A skin test is typically not done under 2 years of age but it can be done by a specialist.
Drugs that interfere with the Allergy Skin Testing results:
Select an area which is more than 5 cm from the wrist and 3 cm away from ante-cubital fossa.
Record the histamine result (positive control) read at 10-15 minutes after the skin prick, and the allergens should be read at 15-20 minutes.
Interpretation of result:
A wheal of 3mm or greater than the negative control is considered to be a positive skin prick test.
A skin prick positive test only indicate that the individual is sensitized to that particular allergen tested. Patient may or may not have clinical allergy.
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