This 250 Food Intolerance Panel tests for 250 food intolerances and other factors that can activate the immune system. It measures changes in size and volume of white blood cells in response to challenges with foods. This is a tolerance test, not an allergy test. Note: This is a pre-paid shipping test kit that will be mailed and it requires a blood draw. Please contact your local hospital, clinic or phlebotomy service for lab specimen collection.