Beckman Coulter Diagnostics, of Brea, Calif., is highlighting results from a study showing that blood tests could offer hope during the initial screening of patients for obstructive sleep apnea (OSA). The study, which included 264 adult male patients, showed that screening for changes in three biomarkers – hemoglobin A1c (HbA1c), C-reactive protein (CRP) and erythropoietin (EPO) – may prove useful in identifying patients with the disorder.