Health effects from beryllium are caused by the body's immune system response to inhaled dust or fumes containing beryllium metal, alloys, or compounds. This immune system response to beryllium is similar to an allergic reaction and may evolve over many years, even decades. Early evidence of this reaction may be detected by a blood test [i.e., the beryllium lymphocyte proliferation test (Be-LPT)] before there is evidence of damage to the lungs. The Be-LPT is used as a screening test for early evidence that an individual may be at higher risk for beryllium disease based on reaction of the immune system to the metal. Positive test results indicate beryllium sensitization. Sensitization is not a disease. There is no impairment from, or symptoms of, sensitization itself.
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