Specific IgE

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Allergic reactions of the immediate type (Type I allergies) are mediated by allergen specific Immunoglobulin of class E. The normal serum IgE concentration is age dependent with a peak at the age of 6-15 years. Mostly, the occurrence of allergen specific IgE is accompanied by increased titers of total IgE in the blood of the patients. In these cases the titer can increase up to 1000fold. Usually, IgE concentrations are determined in international units per millilitre (IU/mL) wherein 1 IU/mL corresponds to 2.4 ng of IgE. Highest IgE concentrations occur in patients with atopic dermatitis in which they often reach levels of 50.000 IU/mL. Moreover, increased titers of IgE can be observed in patients with parasitic diseases. Deviations to the normal values have also been described in patients with certain autoimmune disorders.

Intended Use This total IgE Test is intended for the quantitative determination of IgE in human serum or plasma. The results add to the diagnosis of type I allergies.Furthermore, determination of total IgE is recommended in patients with suspected parasitic diseases.

General features
  • CE labeled
  • User-friendly
  • Coloured reagents
  • Ready to use reagents (except calibrators and washing buffer)
  • Dilution of calibrators and patient samples on plate
  • Breakapart microtiter plates
Technical information
  • Assay time: < 1.5 h at RT
  • 20 µL serum or plasma per test
  • Detection System: HRP/TMB (OD450 nm/620 nm)
  • 6-point calibration (5, 20, 50, 100, 200, 1000 IU/mL) according to WHO 75/502
  • Wide measuring range (5 IU/mL-1000 IU/mL)
  • Detection limit 5 IU/mL
Assay performance
  • Good correlation to the ImmunoCAP®-System (Phadia) R = 0.95
  • Excellent lot to lot correlation R2> 0.95
  • Low intra- and inter-assay variation CV% < 10
  • Excellent correlation to Total IgE EIA (08100CP)
  • Excellent linearity over the entire range

Specific IgE with biotinylated allergens

Diagnosis of allergy
There are some possibilities to examine the individual sensitization. The common diagnostic procedures for detection of IgE mediated allergy encompass the following tests: Skin prick test, Provocation - oral, conjunctival. nasal, bronchial, Blood test/ immunoassay.

An immunoassay allows quantifying the concentration of IgE antibodies (In total or allergen-specific antibodies).

The immunoglobulin E in the patients blood is bound to the monoclonal antibodies and specific allergens of the Specific IgE test. The concentration of IgE can be calculated. Levels of specific IgE that are higher than 0.35 IU/mL suggest that the patient has a sensitization.

For correct diagnosis of allergy the obtained results of specific IgE immunoassays have to be associated with clinical examinations, the case history of each patient and, if necessary, other test kinds.

Allergy is a common disease. A large part of the population of industrialized countries suffers from allergies and the number of affected people is rising steadily. According to the World Health Organization 20% of the world's population is affected by IgE-mediated allergic diseases.

Immunoglobulin E (IgE) is mainly responsible for the development of allergies. The predisposition to suffer from allergy is called atopy. It describes an Individual tendency to develop allergic diseases such as asthma, allergic rhinitis, eczema or dermatitis, conjunctivitis or even anaphylaxis/ anaphylactic shock.

It is well known that both environmental and genetic factors can lead to increased sensitivities against normal environmental proteins. Environmental factors include for example disproportionate hygiene, environmental pollution or repeated contacts with chemicals.

If an allergy occurs, general avoidance of allergens or medical treatment of the symptoms is often the only possibility to relieve the symptoms.

Allergy - What happens inside the body?
Allergy Is an Imbalance of the immune system. The body strongly reacts to, In fact, harmless substances. These substances are called allergens. An allergen is, according to the definition, a small molecule that provokes immune reactions. The list of possible allergens is still growing.

After allergen uptake, antigen presenting cells (APC) exhibit parts of this allergen on their surface to be recognized by T cells. The activated T cells subsequently stimulate B cells to produce antibodies directed cc this certain allergen.

When the mast cells get bound by antibodies, the mast cells get activated and release substances that can Induce acute inflammation, bronchial asthma, urticaria or hay fever. These reactions occur within seconds or minutes depending on whether the allergen is already known to the body and if the specific antibodies still exist or not.