Blood Allergy Testing

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Blood testing may be recommended by your NYC allergy specialist to measure the antibodies present in your blood. One common blood test in the field of allergy measures Immunoglobulin E (IgE). IgE is an antibody that your immune system develops in reaction to a specific allergen. Other relevant blood tests include radioallergosorbent testing (RAST), eosinophil counts, or immunoassay capture test (ImmunoCAP). 

This test is best used for those will skin conditions that cannot complete a skin prick or patch test. Allergy blood tests usually test for ten of the most common allergy triggers, including dust, pet dander, trees, grasses, weeds, and molds. It can also detect food allergies. 

What Allergies Are Tested With Blood Testing ?

● Dust 

● Pet Dander 

● Trees 

● Various Types of Grass 

● Weeds 

● Molds Related To Where You Live

What To Expect During Blood Testing

There are no special preparations for a blood test, which makes it a more convenient option for some. There is also less risk when taking this type of test. Since the allergist is drawing blood and not injecting an allergen, you will not experience an allergic reaction. Blood tests are recommended for people who must take certain medications daily. It is also the best option for those who suffer from severe skin conditions.

During a blood test, an NYC Allergist will insert a small needle and sample a small amount of blood from your vein in your arm. The blood test sample will then be collected in a vial (test tube). This process usually takes less than 5 minutes with minimal to no pain. 

Blood Allergy Testing Frequently Asked Questions

Are Allergy Blood Tests Accurate? 

Allergy blood tests are accurate. However, there are tests that produce false positives and negatives.

Are Allergy Blood Tests Uncomfortable? 

Blood testing procedure is done in less than 5 minutes and is simple, with minimum to no pain.

Can Drinking Too Much Water Affect Allergy Blood Tests?

You can drink plenty of water during your overnight fast. Water will not affect your blood.

Do I Need To Do Anything Before A Blood Test? 

Try to 8-12 hours before a blood test. Drink plenty of water, continue any medication. Avoid food and drinks other than water.

How Long Does A Blood Test Result Take? 

Allergy blood test results typically take between a few days up to 2 weeks for results.

How Long Should You Be Off Antihistamines Prior To The Blood Test? 

You should stop taking over-the-counter medications for allergies, colds, and sinus. Your NYC allergist should have you stop taking them for at least 5 days prior to the blood test. 

What Are Some Side Effects After A Blood Test?

After a blood test, you might experience slight bleeding, bruising, rashing, and temporary soreness.