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How is chronic hives diagnosed?

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To look for causes, you might get some of these tests:

Blood test. Your doctor takes some of your blood and sends it to a lab to look for illnesses or infections.

Biopsy. Your doctor removes a small piece of your skin to look at under a microscope. This is to see if an inflammation of the blood vessels, called vasculitis, may be the cause of your hives.

If you’re still having breakouts and the tests don’t point to a cause, your doctor will most likely say you have chronic idiopathic urticaria (CIU).

From: How Are Chronic Hives Diagnosed? WebMD Medical Reference

SOURCES:

Asthma and Allergy Foundation of America: “Chronic Urticaria (Hives).”

American College of Allergy, Asthma & Immunology:  “Hives (Urticaria),” “Skin Test.”

American Academy of Dermatology: “Hives: Diagnosis, Treatment, and Outcome.”

National Heart, Lung, and Blood Institute: “What is Vasculitis?”

Cleveland Clinic: “Problem Foods: Is it an Allergy or Intolerance?”

Reviewed by Hansa D. Bhargava on January 23, 2019

SOURCES:

Asthma and Allergy Foundation of America: “Chronic Urticaria (Hives).”

American College of Allergy, Asthma & Immunology:  “Hives (Urticaria),” “Skin Test.”

American Academy of Dermatology: “Hives: Diagnosis, Treatment, and Outcome.”

National Heart, Lung, and Blood Institute: “What is Vasculitis?”

Cleveland Clinic: “Problem Foods: Is it an Allergy or Intolerance?”

Reviewed by Hansa D. Bhargava on January 23, 2019

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