In the past, I have had an anaphylactic reaction to shrimp, which sent me to the hospital for medication. How come my FOODStats report from US BioTek does not show elevated IgE levels to shrimp?
IgE antibodies live actively in blood circulation for about 1-2 days, with a residual activity on mast cells for about 2 weeks. Generally speaking, unless the blood sample for the FOODStats ELISA is drawn within this time frame from which the culpable food has been consumed, IgE antibody levels will not be elevated in blood circulation and hence will not show up elevated on the FOODStats report. This, however, does not mean that an anaphylactic food reaction will not re-occur at a future time. Once one has had an anaphylactic food reaction, it is strongly advised to abstain from the suspect food since a second exposure may prove fatal.
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