Crab Allergy IgE Blood Test

What is the purpose of this test?

Order this Crab Allergy IgE Blood Test to measure the IgE antibody levels in the blood and help detect a food allergy to crabs. Seafood allergies affect about 1-3% of Americans, with shellfish being one of the eight most prevalent food allergies. Shellfish are categorized into two groups: crustaceans and mollusks. Crabs are a part of the crustaceans group, which usually triggers more severe allergic reactions. Individuals should also note that a crab allergy may indicate an allergy to other shellfish, such as shrimp, lobster, crayfish, prawns, oysters, clams, etc.

What other food products should I avoid if I have a crab allergy?

Individuals allergic to crabs should not only avoid the specific seafood that causes the reaction but also avoid other shellfish-based products, including:

• Imitation fish or shellfish
• Seafood stock (fish or shrimp)
• Fish oil, including some omega-3 supplements
• Seafood flavorings
• Caesar salad and dressings
• Bouillabaisse
• Salad dressing
• Certain meat dishes that contain seafood-based ingredients
• Surimi (minced fish paste)
• Worcestershire sauce and any products that contain it, such as some barbeques sauces

Additionally, individuals may be allergic to crabs and other shellfish to the point that avoiding seafood markets, handling seafood, or being around cooking seafood is necessary. 

What causes an allergic reaction to crabs?

Once an individual with a crab allergy ingests or comes in direct skin contact with crabs, it triggers a response in an individual's immune system. The immune system views certain substances as harmful and produces IgE antibodies to combat these invaders. Unfortunately, these antibodies cause the chemical histamine to be released, which will cause the symptoms associated with an allergic reaction.

When should I order a Crab Allergy IgE Blood Test?

Individuals may order this Crab Allergy IgE Blood Test if they have experienced symptoms related to a crab allergy. Allergy symptoms vary depending on the individual, ranging from mild to severe reactions. Most food-related symptoms occur within two hours of ingestion; however, they frequently begin within minutes. In addition, the response can be delayed by four to six hours or even longer in some rare cases.

An allergic reaction may affect the skin, intestinal lining, and air pathways. Individuals with a crab allergy may experience one or more of the following symptoms:

• Tingling sensation near or around the mouth
• Swelling
• Abdominal discomfort
• Nausea or vomiting
• Diarrhea
• Itching or hives
• Congestion
• Difficulty breathing, swallowing or wheezing
• Lightheadedness

An extreme, possibly life-threatening allergic reaction known as anaphylaxis may occur in some cases. An anaphylactic response requires immediate medical attention. Signs or symptoms of anaphylaxis may include:

• Rapid or increased heart rate
• Swollen throat or lump making it difficult to breathe
• Low blood pressure
• Extreme dizziness or loss of consciousness