Testing for Hives

Allergy Tests

The simplest way to tell whether someone has hives is through an allergy test. This test may be administered in a controlled environment, such as a doctor's office, or may accidentally occur if an individual eats or comes into contact with something they're allergic to. During an allergy test, a doctor will poke the skin on a person's back with small needles that have come into contact with common allergy-inducing substances, such as pet dander or pollen. After 10 minutes, the doctor will check the pin-pricked spots to see if any have produced a red, elevated hive. If a person should happen to come into contact with an allergy on their own, the body may still respond by producing hives. These hives are not contagious, though they can be dangerous depending on how extreme the allergic reaction is. See you doctor to determine the best course of action for dealing with known allergens.

When to Test for Hives

Doctors typically test for hives when they suspect that an allergen is irritating the person's skin. This is usually done in young children, or in adults who have a history of allergic reactions. If the doctor suspects that the hives are not caused by allergies, further tests will be performed, including blood tests and skin biopsies, to rule out skin infections, skin cancer and other potential diseases like lupus. These tests are usually done when the person has not had a previous allergic reaction, does not remember coming into contact with any substance that could cause an allergic reaction, and has hives that are accompanied by ridged lumps that last for days or cause bruising.

Danger of Hives

Hives are typically nothing to worry about, particularly if they are not accompanied by other discomforting symptoms. They will usually last for a few hours and subside on their own. In fact, allergy testing is rarely necessary for most people, because after the hives appear they can usually determine what the culprit is. They can then easily treat most cases of hives with benadryl or another allergy-relief medication. Riley Children's Hospital (see Resources) also notes that allergy tests are not very effective, as only 9 percent of individuals who go in for testing ever pinpoint what the allergy is that's causing the hives. You should see your doctor, however, if the hives are accompanied by swelling in the throat, trouble breathing or any other distressful symptom. You should also see your doctor if you suspect that shrimp, nuts or latex may be causing your hives, as allergic reactions to these items can be deadly.

Resources

• Hives
• Riley Children's Hospital: Hives