The most common mistake people make is to subject persons with sensitivities to a reverse onus when they report their experience of repeatable, controllable circumstances, contrary to ethics, social convention and laws since the Magna Carta. This practice is unethical in any context, but becomes especially damaging in clinical medicine.
Across Canada, the publicly insured method of diagnosing sensitivities is the patient interview, as an environmental history and possibly in conjunction with a patient journal. The interview covers many of the same areas as described in Hippocrates, "On Airs, Waters and Places."
