How Does a Doctor Diagnose an Allergy?

Medical History

The first step in diagnosing an allergy is for your doctor to take your medical history. They will ask you about your symptoms, when they started, and what makes them worse. They may also ask about your family history of allergies.

Physical Exam

Your doctor may also perform a physical exam. They will look for signs of an allergic reaction, such as swelling, redness, or rash. They may also listen to your lungs for signs of wheezing.

Skin Tests

The most common way to diagnose allergies is through skin tests. In a skin test, a small amount of allergen is placed on your skin, and then a needle is used to prick the skin. If you are allergic to the allergen, a small bump will appear at the site of the prick.

Blood Tests

Blood tests can also be used to diagnose allergies. In a blood test, a sample of your blood is taken and tested for antibodies to specific allergens. If you are allergic to an allergen, your blood will contain antibodies to that allergen.

Challenge Test

In some cases, your doctor may recommend a challenge test. A challenge test involves giving you a controlled dose of an allergen and then observing your reaction. Challenge tests are typically only done when other tests are inconclusive or when your doctor needs to confirm your allergy diagnosis.

Conclusion

Diagnosing an allergy can be a complex process, and it may take some time for your doctor to make a diagnosis. However, by taking a thorough medical history, performing a physical exam, and using allergy tests, your doctor can usually determine if you have an allergy and what is causing it.