Anne
A RAST test should be able to identify what she is reacting to. It may not
be bananas, but what is termed a cross-reaction. For example those reacting
to the specific proteins in natural rubber latex that cause an allergic
reaction may also cross-react to bananas, avocados, Kiwi-fruit, etc. A prick
test - the normal test for type 1 allergy - would not be recommended due to
the severity of her reaction, but a RAST test involves taking a blood sample
and then testing this in vitro, so no real risk for the patient. A good
immunologist could advise on this. I would recommend this, as once the
causative substance is identified it becomes much easier to manage the
condition.
Chris
Chris Packham
FRSPH, FInstSMM, MCMI, MIIRSM, MBICSc
EnviroDerm Services
Unit 10, Building 11, The Mews, Mitcheldean, GL17 0SN
Tel: +44 1386 832 311 (office), +44 1386 830 554 (home)
Mobile: +44 7818 035 898
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