My wife has been diagnosed with latex allergy -- the nurse at her allergist s office said her blood level was 73.7 units/ml, and anything above 5 units/ml indicates an allergy. Thus, she referred to the 73.7 as very high ; a couple of rounds of Medrol Dosepak have gotten the wretched itchy rash under control. She has a follow-up appointment in about a week, but I m curious just how high this reading is -- I can t find any consistent information online about what the mean and standard deviation of this units/ml measure is, so we don t know if 73.7 is one standard deviation above the mean, 2 standard deviations above the mean, 3, or more.