Arrayit Corporation reported that its clinical team has aced four consecutive rounds of proficiency testing (PT) with a nationally recognized proficiency testing leader. Proficiency testing requires precise quantification of specific cellular immunoglobulin E (IgE) antibodies, the protein biomarkers often associated with allergy and asthma. PT samples are blind-tested for IgE concentration as a means of evaluating the accuracy of a clinical test. Arrayit’s clinical team aced four consecutive rounds of PT over a 12-month period, indicating that its microarray testing technology is highly accurate when assessed by an independent third party. Accurate IgE quantification confirms the numerical validity of the company’s allergy test results, which are being increasingly used by doctors and clinics to diagnose, manage and treat patients with allergy and asthma. Outstanding PT scores are important because they facilitate reimbursement by government payors such as the Centers of Medicare and Medicaid Services (CMS) and commercial health insurance providers.