Abstract: Abstract： Objective To investigate the relationship between values of blood calcium, serum urea nitrogen (BUN), Ddimer, C- reactive protein (CRP), fibrinogen and amylase with the severity of the disease in patients with acute pancreatitis (AP). Methods There were 70 patients with mild AP (MAP group), 18 patients with moderate AP (MSAP group), 26 pa⁃ tients with severe acute pancreatitis (SAP group) in 114 AP patients. The laboratory indexes were compared between these groups. The correlation between indexes and the acute physiology and chronic health evaluation system Ⅱ (APACHE Ⅱ ) score was analysed. The diagnostic sensitivity of SAP using CRP, D- dimer and fibrinogen was analysed by ROC curves. Re⁃ sults Compared with MAP group, values of BUN, CRP, D- dimer,fibrinogen and APACHE Ⅱ score were significantly increased in SAP group (P < 0.05), but serum calcium level was significantly decreased (P < 0.05). The APACHEⅡ score were significantly higher in SAP group than that of MSAP group (P < 0.05). There were no significant differences in level of amylases between three groups. There was a positive correlation between APACHEⅡ score, CRP, D- dimer and fibrinogen (r=0.407, 0.404 and 0.245, P＜ 0.05). There was a negative correlation between APACHEⅡ score and serum calcium level (r= -0.333, P＜ 0.05). The area under the ROC curve showed a maximum CRP curve for diagnosing SAP 0.752 (95% CI= 0.644-0.860). The cut-off value was 74.45 mg/L. The sensitivity was 86.4%. And the specificity was 68.2%. Conclusion Combining with monitoring BUN, blood coagulation index, CRP, serum calcium level and other laboratory parameters was useful to overall evaluate AP patients and improve the prognosis.

Key words: pancreatitis, acute disease, C-reactive protein, blood urea nitrogen, fibrinogen, amylases, D-dimer