- RAST test
A RAST test (short for radioallergosorbent test) is a blood test used to determine what a person is allergic to. This is different from a
skin allergy test, which determines allergy by the reaction of a person's skin to different substances. For assessing the presence of specific IgE antibodies, allergy skin testing, when possible, is the preferred method in comparison with various "in vitro" tests because it is more sensitive and specific, simpler to use, and less expensive (http://www.mayoclinicproceedings.com/inside.asp?AID=3978&UID=). [cite journal | last = Ten | first = R | title = Allergy Skin Testing | journal = Mayo Clin Proc | volume = 5 | issue = 70 | pages = 783–4 | year = 1995 | pmid = 7630219]
A RAST test, using a person's extracted blood, detects the amount of
IgEthat reacts specifically with suspected or known allergens. IgE is the antibodyassociated with Type I allergic response: if a person exhibits a high level of IgE directed against pollen, the test may indicate the person is allergic to pollen (or pollen-like) proteins. It is worth noting that a person who has outgrown an allergy may still have a positive IgE years after exposure. Because there are other tests that help with confirmation, results are best interpreted by a doctor.
The RAST was introduced in the 1970s and replaced by a superior test in 1989. Advantages of the new test range from: improved sensitivity without loss of specificity, to excellent reproducibility across the full measuring range of the calibration curve. In general, this method of blood testing (in-vitro, out of body) vs skin-prick testing (in-vivo, in body) has a major advantage: it is not always necessary to remove the patient from an anthihistamine medication regimen, and if the skin conditions (such as
eczema) are so widespread that allergy skin testing can not be done.
The market-leading RAST methodology was invented and marketed in 1974 by Pharmacia Diagnostics AB, Uppsala, Sweden, and the acronymn RAST is actually a brand name. In 1989, Pharmacia Diagnostics AB replaced it with a superior test named the ImmunoCAP Specific IgE blood test, which literature may also describe as: CAP RAST, CAP FEIA (fluorenzymeimmunoassay), and Pharmacia CAP. A review of applicable quality assessment programs shows that this new test has replaced the original RAST in approximately 80% of the world's commercial clinical laboratories, where specific IgE testing is performed. The newest version, the ImmunoCAP Specific IgE 0-100, is the only specific IgE assay to receive FDA approval to quantitatively report to its detection limit of 0.1kU/l. This clearance is based on the CLSI/NCCLS-17A Limits of Detection and Limits of Quantitation, October 2004 guideline.
RAST often are used to test for allergies when:• a physician advises against the discontinuation of medications that can interfere with test results or cause medical complications;• a patient suffers from severe skin conditions such as widespread eczema or psoriasis; or• a patient has such a high sensitivity level to suspected allergens that any administration of those allergens might result in potentially serious side effects.
*A discussion by world renowned experts on the relative value of RAST testing from the American Academy of Allergy, Asthma and Immunology (AAAAI), the largest professional medical specialty organization representing allergists, clinical immunologists, allied health professionals, and other physicians with a special interest in allergy
*ImmunoCAP articles, disease management data, product info from the manufacturer that markets this product:
*Short FAQ's: How a RAST test is performed, results, when ordered:
*A glossary of allergy testing information regarding RAST
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RAST test — Le RAST test est une technique utilisée en Biologie médicale, plus spécifiquement en immunopathologie, pour le dosage quantitatif ou semi quantitatif des IgE spécifiques d allergènes dans le cadre de l Allergie. RAST est le sigle de Radio Allergo … Wikipédia en Français
Rast — or RAST can have several meanings:* Rast, a commune in Dolj County, Romania * Rast, a maqam in Arabic music * Radio Amateur Society of Thailand * RAST test, a blood test for identifying allergies … Wikipedia
Rast — bezeichnet: eine Pause Rast Holding, schweizerische Beteiligungsgesellschaft eine altnordische Maßeinheit, siehe Alte Maße und Gewichte (Skandinavien) einen Maqam in der arabischen Musik Rast ist der Familienname folgender Personen: Christina… … Deutsch Wikipedia
Rast — [rast], die; , en: Pause zum Essen und Ausruhen bei einer Wanderung oder bei einer Fahrt mit dem Auto: eine kurze, ausgedehnte Rast; die Wanderer machten [eine Stunde] Rast; eine Rast einlegen. Syn.: ↑ Halt, ↑ Unterbrechung. Zus.: Mittagsrast. *… … Universal-Lexikon
RAST — bioquím. Siglas de Radio Allergo Sorbent Test. Prueba que permite determinar la sensibilidad inmediata a un antígeno gracias a la determinación del nivel de inmunoglobulinas E presentes en un organismo. Medical Dictionary. 2011. RAST … Diccionario médico
RAST — An allergy test done on a sample of blood. The aim with RAST, as with skin tests, is to check for allergic sensitivity to specific substances. RAST stands for RadioAllergoSorbent Test. * * * Acronym for radioallergosorbent test. * * *… … Medical dictionary
test — 1. To prove; to try a substance; to determine the chemical nature of a substance by means of reagents. 2. A method of examination, as to determine the presence or absence of a definite disease or of some substance in any of the fluids, tissues,… … Medical dictionary
Rast-Loser Schlaf — Klassifikation nach ICD 10 G25.81 Syndrom der unruhigen Beine [Restless Legs Syndrom] … Deutsch Wikipedia
RAST — Radioallergosorbent test (Prueba de radioalergosorbencia) … Diccionario de siglas médicas y otras abreviaturas
RAST — • radioallergosorbent test … Dictionary of medical acronyms & abbreviations