The answer is somewhat dependent on the part of the country you live in and the relative frequency of various vespids. I tend to test for all of the non-honeybee vespids present in our county when a person is sure they were not stung by a honeybee. This may be three or so additional tests, but it answers the question.
I hope this information is of help to you and your patient.
Eric Macy, MD, MS, FAAAAI