A 19-year-old man complains of severe fatigue, sore throat,…
A 19-year-old man complains of severe fatigue, sore throat, and swollen lymph nodes. Manual differential counts: WBC: 11.3 Band neutrophils: 8 RBC: 4.99 Segmented neutrophils: 12 Hgb: 16.1 Lymphocytes: 78 Hct: 49.0 Monocytes: 2 MCV: 98.2 Eosinophils: MCH: 32.3 Basophils: MCHC: 33.3 Metamyelocytes: RDW: 11.9 Myelocytes: PLT: 138.9 Promyelocytes: The pic below demonstrates many of the lymphocytes seen on the peripheral smear. What additional test should be performed?