Allergy

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Medical Video: Allergy Symptoms & Treatments : How to Cure Dust Allergies

Definition

What is allergic passing blood?

This test can measure plasma levels of immunoglobulin E (IgE) to diagnose allergies and detect allergens (allergens). IgE levels in allergic patients will increase when they meet with allergens. There are various types of allergens that cause allergic symptoms, such as feathers, food, pollen, fungi, insect poisons, drugs and other factors in the work environment.

When should I have an allergy test passing blood?

This test is done if you have symptoms of allergies to certain allergens. Allergy symptoms include:

  • dermatitis
  • eczema
  • red and itchy eyes
  • cough, stuffy nose and runny nose
  • asthma
  • itching and numbness in the mouth
  • abdominal pain, vomiting and diarrhea

Prevention & warning

What should I know before undergoing an allergy test passing blood?

Contraindications include:

  • patients with more than one allergy
  • lack of test information, unless certain allergens have been detected

Several factors can influence results, including:

  • diseases that increase levels of IgG (an immune protein in the body)
  • drugs that can increase levels of IgE (eg corticosteroids)

Pay attention to warnings and precautions before undergoing this treatment. If you have questions, please consult a doctor for further information and instructions.

Process

What should I do before undergoing an allergy test passing blood?

There is no special preparation before undergoing this test. The doctor may conduct a clinical examination first. Consult with doctor about certain preparations before the test. Before undergoing the test, the medical officer will make sure you are free from corticosteroid use. This is done because the drug can affect the results of this test. You are recommended to use short-sleeved clothing to make it easier to take blood samples from your hands.

How is the allergy test process passing blood?

The medical personnel who are in charge of taking your blood will take the following steps:

  • wrap an elastic belt around your upper arm to stop the blood flow. This makes the blood vessels under the bond enlarge making it easier to inject needles into the vessels
  • clean the part to be injected with alcohol
  • inject a needle into a vein. More than one needle may be needed.
  • attach the tube to the syringe to fill it with blood
  • remove the ties from your arms when taking blood is enough
  • attach gauze or cotton to the injected part, after the injection is finished
  • put pressure on the part and then put on a bandage

What should I do after having an allergy test passing blood?

Some people may feel pain when a syringe is inserted into the skin. But for most people, the pain will gradually disappear when the needle is right in the vein. Generally, the level of pain experienced depends on the expertise of the nurse, the condition of the arteries, and a person's sensitivity to pain. After going through the process of taking blood, wrap your hands in a bandage. Press the vein slowly to stop bleeding. After doing the test, you can do activities as usual. If you have questions about the test process, please consult a doctor for further instructions.

Explanation of Test Results

What do the test results mean?

Normal

Normal range:

Adults: 0-100 international units / mL

Children:

  • Age 0-23 months: 0-13 international union / mL
  • Age 2-5 years: 0-56 international units / mL
  • Age 6-10 years: 0-85 international units / mL

RAST range:

RAST rangeIgE level (kU / L)IgE allergen level

(level of allergen specific IgE)

0<0.35Absent (none)
10.35-0.69Low
20.70-3.49Is being
33.50-17.49High
417.50-49.99Very high
550.0-100.00Very high
6>100.00Extraordinarily high

Abnormal:

Allergic related diseases for example:

  • asthma
  • dermatitis
  • food allergies
  • medicine Allergy
  • allergic work environment
  • allergic rhinitis
  • angioedema

The normal range for blood allergy testing can vary depending on the laboratory you choose. Discuss with your doctor if there are questions about your test results.

Hello Health Group does not provide medical advice, diagnosis or treatment.

Allergy
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