In diagnosing a soy allergy, a physician will conduct a medical examination of the patient as well as compiling a medical history and a list of symptoms. If an allergy is suspected, the physician will perform one or more allergy tests.

The only form of treatment for soy allergy is the complete removal of problem foods from the diet, known as avoidance. There are no drugs available that can prevent a soy allergy from taking place in people who are sensitive.

Once a physician has pinpointed soy as a problem allergen, patients should remove all soy and soy-based products from their diet by paying close attention to the ingredients in the foods they eat. By checking the ingredient labels on foods at the grocery store and asking about ingredients and preparation techniques at restaurants, people can successfully avoid problem foods and control their soy allergy.

To be sure that soy is not consumed accidentally, people should also learn alternate names for soy and check the labels of processed foods for soy products.  

As of January 2006, food manufacturers are required by the Food & Drug Administration (FDA) to clearly list food allergens on their product labels. This may make it easier for people to determine if a food item contains a potential allergen.

Various drugs can help treat symptoms related to soy allergy reactions once they have appeared. These include antihistamines, corticosteroids, mast cell stabilizers and epinephrine. 

For a long time soy milk was considered a good alternative for infants who could not drink regular milk or were at increased risk of food allergies. However, as more and more infants switched to soy milk formulas, it became clear that soy, too, was a major food allergen (though there is no cross-reactivity between cow's milk and soy – each triggers an allergic reaction independently). For this reason, soy formulas are no longer considered a safer type of formula for at-risk infants.

Research into creating varieties of allergen-free soybeans has yielded some success. Allergen-free soybeans have been created in laboratory tests and could one day begin to replace the allergy-causing lines currently being grown. If widely adopted, these new soybeans could reduce the number of allergies triggered by the accidental ingestion of a soy-containing food.