Serum IL-6 and procalcitonin are two promising novel biomarkers for evaluating the severity of COVID-19 patients

To evaluate the development of coronavirus disease 2019 (COVID-19), the roles of interleukin 6 (IL-6) and procalcitonin (PCT) were assessed to diagnose severe COVID-19. Between January and February 2020, 100 consecutive patients with confirmed COVID-19 were included and divided into common (n = 56), severe (n = 28), and critical (n = 16) groups. IL-6 and PCT levels were assayed and compared among groups. IL-6 levels were significantly different among groups (common, 23.93±9.64 pg/mL; severe, 69.22 ± 22.98 pg/mL; critical, 160.34 ± 26.15 pg/mL; P < .05), and there was also a significant difference in the levels of PCT among groups (common, 0.23 ± 0.13 ng/mL; severe, 0.38 ± 0.16 ng/mL; critical, 0.73 ± 0.36 ng/mL; P < .05). Further analysis showed that patients in the critical group had the highest levels of IL-6 and PCT, and those in the common group had the lowest levels (all P < .05). IL-6 and PCT are associated with the severity of COVID-19, and thus have potential value in the diagnosis of COVID-19.