Know About An Allergy Skin Prick Test vs. Allergy Blood Test


Allergies are a common and growing health concern affecting millions worldwide. They can range from mild symptoms such as sneezing and itching to serious reactions like anaphylaxis, which can be life-threatening. Identifying the allergen causing these reactions is critical to managing and treating the allergy. Two primary methods are used to diagnose allergies – allergy skin prick tests and allergy blood tests.

  • Allergy Skin Prick Test

An allergy skin prick test, or a puncture or scratch test, is a diagnostic procedure used to determine if a person has an allergic reaction to a particular substance. The test involves applying a small amount of allergen extract to the skin, usually on the forearm or back, and then pricking or scratching the skin’s surface to allow the allergen to enter the body. The test measures the skin’s reaction to the allergen, with results visible within 15-20 minutes.

Experts from state that the skin prick test is relatively safe and straightforward but can cause mild discomfort and itching at the test site. Rarely can it trigger a severe allergic reaction, so the patient must remain under medical supervision during the test. The results are usually ready within 15-20 minutes, making it a quick and efficient method for identifying allergic reactions.

  • Allergy Blood Test

An allergy blood test, also known as a serum or allergen-specific IgE test, is another method used to identify allergies. The test measures the amount of specific IgE antibodies in the blood produced by the immune system in response to allergens.

The blood test is usually ordered when a patient cannot undergo skin prick testing due to medication use or skin conditions such as eczema or psoriasis. It is also commonly used to confirm allergy diagnosis or monitor allergy treatment’s effectiveness.

Allergy blood tests are generally safe and pose minimal risk to patients, although some may experience minor discomfort or bruising at the site where the blood was drawn. Results are typically available within a few days to a week, depending on the lab.

  • Comparing Skin Prick Test and Blood Test

Both the skin prick test and allergy blood test are effective in diagnosing allergies. However, they have some differences in accuracy, speed, and convenience.

  • Accuracy: Both tests are highly accurate, with the skin prick test slightly more sensitive than the allergy blood test. Skin prick tests are more likely to detect an allergy in people with mild or early-stage allergies, while blood tests are better suited for people with severe allergies.
  • Speed: The skin prick test provides immediate results, while the allergy blood test takes longer to process and may take a few days to a week to get the results.
  • Convenience: Skin prick testing requires an in-person appointment with a healthcare provider, while the blood test can be performed at any time and may not require an office visit.

Health insurance plans generally cover both tests. However, the skin prick test may be less expensive than the allergy blood test. Ask your medical practitioner which one to opt for.