The Pearson correlation results showed that on the first day after admission, there were positive relativity between the levels of PCT (r = 8.321, P < 0.05), 25(OH)D (r = 9.182, P < 0.05), PTX-3 (r = 8.132, P < 0.05) or AMS (r = 7.121, P < 0.05) and severity of pancreatitis complicated by diabetic ketoacidosis. The gene discussed is PTX3; the disease is diabetic ketoacidosis.