Objective: In cases with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) disease clinical usefulness of serological tests remains uncertain. The study aimed to evaluate anti-SARS-CoV-2 antibody and some biochemical parameters such as leukocyte (WBC), neutrophil (NEU), lymphocyte (LYM), thrombocyte (PLT), erythrocyte (RBC), hemoglobin (Hb), ferritin, procalcitonin (PCT), C-reactive protein (CRP) and D-dimer in the patient specimens sent from the polyclinic and service/intensive care unit.

Materials and Methods: A total of 110 patients’ specimens sent from the polyclinic and from the service/intensive care unit were used. SARS-CoV-2 RT PCR, immunoassay SARS-CoV-2 antibody and other biochemical tests were assessed.

Results: Anti SARS CoV 2 antibody was positive in 11 (5 polyclinic, 6 service/intensive care) of 24 patients with negative RT-PCR test. Significant difference was determined between the two groups from the polyclinic and service/intensive care unit in terms of WBC, NEU, RBC and Hb, ferritin, CRP, PCT and D-dimer levels (p= 0.001, 0.007, 0.002, 0.006, 0.001, <0.001, 0.012 and 0.001, respectively), whereas other parameters (lymphocyte, platelet) showed no significant difference.

Conclusions: Because of gradually increasing rate of exposure to SARS CoV 2, we suggest that seroprevalence needs to be determined, antibody levels should be identified before vaccination, and antibody should be studied in the symptomatic patients with negative RT-PCR.