An IL‐2 receptor level greater than 150 pg/mL is associated with a sensitivity of 61% and a specificity of 93% for the diagnosis of NS (Petereit et al., 2010); (ii) assay of the CSF CD4/CD8 ratio, with parallel use of this assay in pulmonary sarcoidosis diagnosis. The gene discussed is CD8A; the disease is pulmonary sarcoidosis.