15/03/2024
Why Skin Prick Testing and not blood testing to find out allergen?
(1) First & foremost is reliability, practically all standard textbooks of Allergy say that confirm report of positive allergens (blood tests) by skin prick test before going for further treatment. Then why not to go directly for Skin Prick Testing?
(2) Collection of blood sample, proper labeling, proper transport (maintaining cold chain),latest well serviced equipment, well trained staff ....play a major role in reliability of report, human error and machine error play significant role.
(3) Skin Prick Allergy Testing is done by Allergy Specialist himself in front of patient and relative with the same allergens which show positivity in other patients on day to day basis.
(4) Allergens available for blood testing are not those prevalent in local area as many kits are imported e.g. certain pollens prevalent in our country are not present in the testing kit and many are present which are not even in our country so it is meaningless exercise in many cases.
(5) Many blood testing advocates frighten patients of reaction in skin prick testing, but now a days with good allergen extracts and prick method instead of intradermal injection method it has become rare.
(6) When patient himself/herself sees swelling and redness over skin it convinces him/her along with treating Allergologist regarding positive allergens, so he/she becomes ready for immunotherapy.
(7) Skin Prick Testing is a very gentle superficial prick where even blood don't comes out so it is not painful. Even children easily allow to perform testing.
(8) Reports are faster i.e. with in few hours. Blood report may take many days or weeks if carried out in distant big laboratories..usual scenario
(9) Skin Prick Testing is cheaper
(10) Lastly in blood testing different groups are made of allergens and they are tested together so sometimes positivity to single allergen is not known.