How many types of a blood test for food allergies are there?




Life becomes very difficult for people who are suffering from food allergies. They have to be very careful during the entire day because a specific type of food can trigger an allergic reaction. But what of those who are unaware of their situation? For theblood test for food allergiesis available to determine which kind of food is harmful to them.

Two main types of blood test for food allergies

Although there are many tests that can help to diagnose the food allergies experts recommend blood tests to be conducted to find out the allergen for the allergic reaction.There are two types of blood tests are run to find out whether you have food allergies or not.
Enzyme-linked immunosorbent assay (ELISA, or EIA)
Allergies are triggered when the immunity system of the body is disturbed by specific allergens. So this test uses chemicals and antibodies to notice responses of the immunity system; in this case allergens of food is introduced in the blood and the level of antibodies is counted whether you are suffering or not.
The radioallergosorbent test (RAST)
In this test radioactive molecules are used to spot IgE antibodies that are only found in mammals. Normal blood is drawnfrom the arm of the person and there a number of food allergens are tested on it. The main allergen that is the cause will glow because of the radioactive material.

Reasons for Recommendation of Blood Tests

In spite of having so many other tests like skin tests, elimination diet test and oral food challenge; allergists recommend the two above mentioned blood tests for people who want to know whether they are suffering from food allergies or not. Below are six reasons why doctors recommend blood tests.
If the medication is interfering
There are certain tests which can only be conducted if you stop taking some specific medications. Many people are on medications which they can’t stop taking for even a single day and several other tests results can be an effect from these medicines. But during blood tests,there is no need to stop taking the pills.
Not tolerant of Skin Patch Test
Patients suffering from extreme skin conditions like dermatitis, eczema or psoriasis can’t take undergo any type of skin tests that can be conducted by any clinic such as Atlanta Allergy. Even the slightest exposure to the allergen can trigger a severe reaction which can lead to harsh consequences.
Asthma can’t be controlled
Many different allergens can be the reason for an asthma attack. Coming in contact with it can have life-threatening because it affects the windpipe and can even block the air passage; making breathing hard. For these individuals,blood tests are the right option.
Severe Heart Condition
Almost all allergic reactions have some symptoms that are related to the heart. So if you come in close proximity of the allergen then it may happen that several heart conditions can worsen. These conditions can include increased heartbeat, uneven heart rate or even ceasing of the heart. To avoid all these blood tests are conducted.
Have Diagnosed Skin Allergies
You have a history of diagnosed skin allergy but the skin tests have not yet determined the cause then you can have blood tests just to be safe. If you go through a skin test and start having an allergic reaction then it can become a problem. But blood tests will make sure that the diagnosis is made but without doing harm.
Life-Threatening Allergic Reaction
There are various allergens that have an intense reaction which can even threaten the life of the patient. When the person is exposed to the allergen; within minutes and even seconds, the body starts to the response. So it is better to avoid all other tests that come in close contact with the patient.

Advantages of Blood Tests for Food Allergies

Having knowledge of various conditions in which other tests can’t be done; still, people insist on having other tests to determine the allergen they are hypersensitive to. Although the result for other tests is far quicker than the two types of blood tests many other advantages over-shadows this delay.
Less Risk for the Patients
The patients don’t risk their lives to find out the type of allergen for their allergy. Many patients are more sensitive to the allergens than others; so their reaction time is quick and severe. Exposing the directly to the antigen is dangerous, but testing it on their blood is less risky.
Safe to Use
In the test, the lab assistant will take a vial of blood from your vein in your arm. Then conduct either Enzyme-linked immunosorbent assay (ELISA, or EIA) or Radioallergosorbent test (RAST)on the blood with the help of various allergens. Only your blood will be exposed to the allergens not you in person.

Tests can be done if using Allergy Medications

The blood test for food allergies can be conducted even if you are already taking any type of medication. Even if the patient is taking allergy medication then the tests can be conducted without having any fear at all.

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