RAST test: allergy blood tests explained
Last updated: 17 January 2017
What is an allergy blood test?
An allergy blood test (radioallergosorbent or RAST test) may be requested when a specific allergy is in question.
The test gives an indication of antibodies to a specific trigger antigen, such as pollen or house-dust mite.
When would you need a RAST test?
Your doctor may request a RAST test in the event of severe allergy, asthma or hayfever, where the precipitating substance (known as an antigen) is not clear.
A subgroup of antibodies called IgE antibodies are strongly associated with the abnormal immune system response in allergic reactions.
Amongst these IgE antibodies, allergen-specific IgE antibody numbers can be measured by the RAST test.
How is a RAST test performed?
A radioallergosorbent test is a blood test and requires a blood sample from a vein.
RAST test results explained
RAST test results are given in terms of an antibody titer.
Related tests
- Differential white cell count (Diff)
- Respiratory function tests (RFTs)
- Peak expiratory flow Rate (PEFR)
Also known as
- Radioallergosorbent test
- IgE
- Allergy screen
Links
A: Use HealthEngine to find and book your next Allergy Clinic appointment. Click on the following locations to find a Allergy Clinic clinic in your state or territory.
This article is for informational purposes only and should not be taken as medical advice. If in doubt, HealthEngine recommends consulting with a registered health practitioner.
All content and media on the HealthEngine Blog is created and published online for informational purposes only. It is not intended to be a substitute for professional medical advice and should not be relied on as health or personal advice. Always seek the guidance of your doctor or other qualified health professional with any questions you may have regarding your health or a medical condition. Never disregard the advice of a medical professional, or delay in seeking it because of something you have read on this Website. If you think you may have a medical emergency, call your doctor, go to the nearest hospital emergency department, or call the emergency services immediately.
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