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An IgE level greater than 2,000 IU/mL is often considered diagnostic. [17] However, patients younger than 6 months of age may have very low to non-detectable IgE levels. Eosinophilia is also a common finding with greater than 90% of patients having eosinophil elevations greater than two standard deviations above the normal mean. [ 18 ]
Atopic individuals can have up to ten times the normal level of IgE in their blood (as do sufferers of hyper-IgE syndrome). However, this may not be a requirement for symptoms to occur as has been seen in asthmatics with normal IgE levels in their blood—recent research has shown that IgE production can occur locally in the nasal mucosa. [28]
More specifically, optimal levels are generally close to a central tendency of the values found in the population. However, usual and optimal levels may differ substantially, most notably among vitamins and blood lipids, so these tables give limits on both standard and optimal (or target) ranges.
Cholinergic urticaria or sharp pain over the entire body induced by elevated body temperature was reported in 32 cases (50%). Of 28 cases tested, 12 (43%) displayed elevated serum IgE levels. Skin biopsy was performed in 53 cases, with normal findings in 20 cases (38%), and cellular infiltrates in sweat glands or ducts in 23 cases (43%). [1]
The RAST is a radioimmunoassay test to detect specific IgE antibodies to suspected or known allergens for the purpose of guiding a diagnosis about allergy. [10] [11] IgE is the antibody associated with Type I allergic response: for example, 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.
When serum IgE is normal (and patients are not being treated by glucocorticoid medications), ABPA is excluded as the cause of symptoms. A raised IgE increases suspicion, though there is no universally accepted cut-off value. Values can be stated in international units (IU/mL) or ng/mL, where 1 IU is equal to 2.4 ng/mL. Since studies began ...
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i put the 'Expert-verify' tag in the article because the key information of what the normal levels of IgE are in ng/mL or kIU/L is missing. "> 10 times normal" is rather vague when neither this article nor Immunoglobulin E have a referenced value of the normal value or a normal range. Boud 22:38, 14 August 2008 (UTC)
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