Munson Health
 
Food Allergy

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by Carson-DeWitt R
 

Symptoms

Symptoms include:
  • Skin rash, especially hives
  • Swelling in lips, mouth, tongue, throat
  • Stomach cramps, pain
  • Nausea
  • Vomiting
  • Diarrhea
  • Skin itching
  • Cough
  • Wheezing
  • Shortness of breath
  • Nasal congestion
  • Severe drop in blood pressure
  • Gurgling stomach
Hives
Splotchy body rash -adult
© 2011 Nucleus Medical Media, Inc.
 

Diagnosis

The doctor will ask about your symptoms and medical history. A physical exam will be done. Food allergies are often diagnosed based on your own observations. It is a good idea to keep a diary of your symptoms. Note when the symptoms occur and what you have eaten.
Tests may include:

Scratch Skin Test

The doctor will place a diluted extract of the food on the skin of your forearm or back. The skin is scratched with a small pick or tiny needles. If there is swelling or redness, an allergic reaction may be present. The doctor will make the diagnosis based on the skin test and your history of symptoms. In rare cases, skin tests can have a severe allergic reaction. This test should only be used under the supervision of a physician or other trained medical personnel. Severe eczema may make this test hard to interpret.

RAST or ELISA Test

The doctor may order blood tests (RAST or ELISA). These tests measure the level of food-specific IgE in the blood. IgE is a type of protein that the body produces when it is exposed to something which it is allergic. The presence of IgE in the blood may indicate an allergy but is not enough to make a diagnosis.
 

RESOURCES

American Academy of Allergy, Asthma, and Immunology
http://www.aaaai.org/

Food Allergy and Anaphylaxis Network
http://www.foodallergy.org/

 

CANADIAN RESOURCES

Allergy Asthma Information Association
http://aaia.ca/

Calgary Allergy Network
http://www.calgaryallergy.ca/

 

References


Boyce JA, Assa'ad A, Burks AW, et al. Guidelines for the diagnosis and management of food allergy in the United States: summary of the NIAID-sponsored expert panel report. Nutr Res . 2011 Jan;31(1):61-75.


Dambro MR, Griffith JA. Griffith's 5-Minute Clinical Consult. Baltimore, MD: Lippincott, Williams, and Wilkins; 1999.


Food allergy: an overview. National Institute of Allergy and Infectious Diseases website. Available at: http://www3.niaid.nih.gov/topics/foodAllergy/PDF/foodallergy.pdf . Published July 2007. Accessed July 7, 2009.


Food Allergy and Anaphylaxis Network website. Available at: http://www.foodallergy.org . Accessed July 7, 2009.


Middleton E. Allergy: Principles and Practice. 5th ed. St. Louis, MO: Mosby-Year Book, Inc.; 1999.

 

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