Peanut allergy false positive? - 13 months old

[itsmehere1]

Hi! So my little girl had a reaction( vomiting ) to scrambled eggs and was prescribed a RAPT blood test. She got tested for various other allergens. It has come back now and it says she is allergic to peanuts and wheat in addition to egg whites. I wanted to know if there’s any chance of false positives in blood test and what are their accuracy levels if any one knows. I only ask because she has been eating peanut in powdered form mixed surf her food and weetabix since 6 months and has had no reactions at all. We will obviously avoid giving her these now but seems strange that she had been tolerating those foods until we she was tested.

Hi, yes you can get false positives. The only way to tell for definite is to eat the foods.

If she's eating peanuts with no issue just now the worst thing you could do is to stop giving it to her as she may lose any tolerance she has.

My DS tests positive to almonds but has almond milk for breakfast every day.

Thanks, that’s very useful to know. So the GP who told me the results mentioned that often these tests may not be fully accurate and she will get us referred to allergy specialist/ dietician. I asked her if it was fine to give my dd wheat and peanuts as we have been, she actually encouraged me to do it for the same reason you gave. After some time I have received a call stating not to give her peanuts at all as she is not sure and to check with allergy specialist which has scared me.

I also found this link which has helped eased my shock a bit

medicalxpress.com/news/2010-02-child-food-allergy-real-trigger.html

Allergy diagnosis is based on clinical history as well as bloods/skin prick test. If she's been tolerating a peanuts and wheat flour you should definitely keep it up as egg allergy increases the risk of developing a peanut allergy