The study was a retrospective, single-center clinical study. From all patients admitted to the emergency ICU during the period of 2013.1.1-2019.12.31, the investigators screened all patients who met the criteria of 1) ≤7 days from symptom onset to enrollment; 2) patients who also met the criteria of the presence of clinical infections and Sequential Organ Failure Assessment (SOFA) score ≥2; and 3) met the exclusion criteria, and retrospectively collected coagulation indices of the patients before anticoagulation with or without the use of heparin or low molecular heparin, and recorded the worst values of coagulation function of patients before heparin were recorded, and the organ function, inflammatory response, immune indexes, and conversion rate of severe disease were observed, so as to investigate the role of conventional coagulation indexes (FDP, D-dimer) and thromboelastography in the early diagnosis of septicemia patients and to indicate the prognosis.

Inclusion Criteria:

• Time from clinical symptoms to admission ≤ 7 days；
• infection was diagnosed by clinician
• Systemic inflammatory response syndrome，Systemic inflammatory response syndrome was defined as the presence of 2 or more of the following: (1) temperature <36℃or >38℃, (2) heart rate >90 beats per minute, (3) respiratory rate >20 breaths per minute or PaCO2 < 32 mm Hg, or (4) white blood cell count ≥12 000 cells/mm3 or≤4000 cells/mm

Exclusion Criteria:

• Pregnancy and lactation
• Have hematological diseases (including acute and chronic leukemia, hemolytic anemia, hemophilia, aplastic anemia, bone marrow fibrosis, congenital or acquired coagulation factor deficiency, etc.)
• Anticoagulant or antiplatelet drug treatment
• 24 hours after severe trauma or surgery
• Autoimmune diseases
• cirrhosis
• Malignant tumor patients with personal history or undergoing radiotherapy, chemotherapy and targeted treatment

The study was a retrospective, single-center clinical study. From all patients admitted to the emergency ICU during the period 2013.1.1-2019.12.31, all patients who met the enrollment criteria were screened, and the coagulation function indexes of patients with or without heparin or low molecular heparin before anticoagulation were retrospectively collected, the worst value of coagulation function of patients before heparin was recorded, and the organ function, inflammatory response, immune indexes, and the rate of conversion to severe disease of the patients were observed, so as to To investigate the role of conventional coagulation indices (FDP, D-dimer) and thromboelastography in the early diagnosis and prognosis of patients with sepsis.