Abstract: Objective:Toinvestigatetheclinicaleffectsofserum procalcitonininpatientswhosufferedseveretraffictraumaonYunnan-
Tibet Highway. Methods: From January 2015 to December 2017, 1 396 patients with severe head injuries, liver and spleen ruptures,
thoracoabdominal injuries or multiple injuries who were admitted to 32268 Army of Chinese PLA after traffic accidents on Yunnan-Tibet
Highway were selected and observed for PCT, blood culture and secretion culture. The value of PCT in diagnosing the infections of
patients who suffered severe traffic trauma on Yunnan-Tibet Highway was analyzed. Results: The PCT level of patients in the infected
group was significantly higher than that in the control group［（5.38±2.71）vs.（0.56±0.42）ng/mL, P<0.01］; the area under ROC curve of
PCT in the diagnosis of patients who suffered severe traffic trauma on Yunnan-Tibet Highway was［0.897（0.778-0.981）, P < 0.01］; The
positive rate of blood culture was 16.39% and PCT was 80.60% in the infected group after 24 hours of fever. PCT level of patients infected
with gram-negative bacilli was significantly higher than that of patients infected with gram-positive bacilli. Conclusion: PCT can be
used as a diagnostic index for infections of patients who suffered severe traffic trauma on Yunnan-Tibet Highway.

Key words: procalcitonin, Yunnan-Tibet Highway, severe, traffic injuries, infection