Local lyophylized food extracts are available useful in skin prick test and atopy patch test to confirm food allergy. However, the investigators want to know the duration that the investigators can keep the extracts for the usage in this purpose.
Food allergy incidence increases world wide. The diagnosis mostly depends on history. Skin prick test and atopic patch test are useful in finding the causative foods in some cases. The local food extracts have been shown to be at least as effective as commercial ones. From previous study the investigators keep the extract at 2-8 degree Celsius for 1-3 months for the usage. The investigators want to evaluate the duration that the extracts are still useful in diagnosis food allergy
Study Type
OBSERVATIONAL
Enrollment
60
The cases are pricked and patched with local food allergen extract at different storage times (0, 3 and 6 months after preparation)
Siriraj hospital
Bangkok, Thailand
RECRUITINGMean wheal diameter of skin prick test
The skin prick tests are performed with local prepared food allergen at keeping time of 0, 3 and 6 months after the preparation.
Time frame: 2 years
Result of atopy patch test
atopy patch tests are performed with local prepared food allergen at keeping time of 0, 3 and 6 months after the preparation.
Time frame: 2 years
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