I only need a blood test to diagnose a food allergy

Blood tests can also help diagnose a true food allergy by measuring IgE levels and determine whether theres a true food the routine use of these tests and making a food allergy diagnosis based on them alone. allergy. However, the new guidelines recommend againstFleischer warns that blood tests can produce false positives results that indicate an allergy when there isn t one in patients who have eczema, asthma, or other types of allergies because those people already have higher than average.