Friday, 15 March 2013

My Allergy Skin Prick Test


My first post and I decided to share this not so pretty sight of my inner forearm after being administered skin prick allergy test. After suffering from allergic rhinitis for almost 20 years (edit: read my long story here ), I finally did this test last August. Geez, I have not idea why it took me so long to get it done but am glad I got it done to confirm my source of allergy - dustmite.
  
I was tested for 14 types of nasal allergens and 4 types of food allergens. The skin on my inner forearm was pricked with a tiny amount of the suspected allergens and within about 20 minutes, skin around the prick became red and swollen, and had the wheal and flare reaction. Wheal is the red raised spot, many of them on my arm as seen in the picture. Having a red wheal don't necessarily indicates an allergy to that allergens. For my test (it might differ from test to test), I believe the wheal needs to be measuring at least 5mm in diameter to indicate allergy as my report showed I was allergic to dustmite and dog hair - both of which measured 5mm to 6mm while the rest like mold, cockroach, cat fur etc was less than 5mm.
  
The test is over quite quickly and painless. I highly recommend you take this test if you suspect you are suffering from allergies and would like to find out the source. You need to know the allergens you are reacting to in order to manage it effectively.

Note: If you are taking the skin prick test, avoid taking anti-histamines medications for about a week before the test so as not to affect the results of the test.

For more information on allergy skin prick test:

2 comments:

  1. Great first post! I am not confident in the accuracy of any allergy tests as we've learned first hand about the abundance of false positives and negatives when it comes to testing. My son tests negative to multiple food allergies, but we know he's anaphylactic to dairy. There are so many people I've spoken with that experience inaccurate test results, so I just take them with a grain of salt. Now after testing, we do a food challenge to confirm if the food is a true allergy or not. I suppose I need to determine a way to do this with environmental allergies as well. Do you feel your results were accurate?

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  2. Hi Jennifer,
    Yes, they were. The skin prick test was an added confirmation as I have always supsected that I was allergic to dustmite as my allergy would flare up when I do packing of dusty items or cleaning up of dusty areas. I would also wake up in the middle of the night sneezing away - must be the dust mites on my mattress! Am not so sure of the dog hair which I was tested positive for as I don't have them at home.

    The skin prick test which was conducted on me had some positive control and negative control for histamine, so in this aspect, I think the test should be pretty fair.

    Did your son take skin prick test for his food allergies or other types of allergy tests?

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