I don’t know the clinical names for the tests I’ve done, but I’ve had allergy testing where they prick the skin inside the arms with different substances to look for a histamine reaction. I’ve also had allergy testing that they drew blood for. Both were negative for food allergies. The skin test said I’m sensitive to maple pollen of the environmental substances, while the blood test was negative for any allergies. Through life experience, I have determined that I have sulfite sensitivity, due to a long history of reaction to ****, and a recent reaction to skin care products containing sulfites. My mother has Celiac sprue, which was diagnosed about 10 years ago by intestinal biopsy. Shortly after that, they discovered that they can test for antibodies for gluten intolerance. Although the condition can be hereditary, they won’t test me since I’m asymptomatic.