You do not specify if the test done by your doctor, who I presume is a GP, was a RAST multidisc which screens for a number of different food antigens on one disc or individual tests. The multidisc is the most common way that GPs order RAST or ImmunoCap blood tests, because Medicare only rebates for a RAST of 4 antigens or group of antigens. You list 5 different foods so I suspect it was a multidisc and therefore not very helpful, as your child may be allergic to only one of those foods or to several of them.
This would explain the dilemma you are experiencing with not knowing exactly which foods he can safely eat. This can adversely affect his nutritional status, thereby compromising his growth and development.
I would recommend you ask your GP for a referral to an allergist/immunologist, preferably paediatric, in order to assist you with identifying the specific food or foods to which you son is really allergic to and if this is contributing to your son's atopic dermatitis (eczema). Atopic refers to "allergic" and dermatitis is "inflammation of the skin", which is a good description of this condition.
You mention testing for other allergies. At this age the only environmental allergen to which he may show an allergy, particularly if you live in a coastal city, especially Sydney, is house dust mite. There are two main types, with the long names of Dermatophagoides pteronyssinus or farinae. It is not uncommon for children of your son's age of 15 months, to have evidence of allergy to dust mite by skin tests, which is preferable, as it is easier to do and less painful than a blood test (RAST).
There is no limitation on the number of antigens that can be tested by skin tests, so all the foods identified by the blood test can be tested individually.
It is important to note that atopic dermatitis indicates an atopic predisposition, with about 80% of these children developing symptoms of allergic rhinitis (hay fever), allergic conjunctivitis and possibly asthma, especially if there is a family history of these conditions. It is likely that you may have allergies, as boys seem to be more likely affected if the mother suffers from various allergies. There is a genetic predisposition, with about a 30% chance of having a child with allergies if one parent has allergies and 70% if both parents have various allergies.
It is also important to remember that house dust mite is a common environmental allergen and can impact on atopic dermatitis, allergic rhinitis and conjunctivitis and also asthma.
So pretty much an interplay between genetics and the environment.
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