Data on 4G/5G polymorphism of plasminogen activator inhibitor-1 (PAI-1) gene are limited in Asian patients with sepsis. Therefore, the investigators aim to prospectively investigate the incidence of 4G/5G polymorphism and its relationship with disseminated intravascluar coagulatin in patients with severe sepsis and septic shock.

Inclusion Criteria:

• Adult patinents aged > 18 years, Patients satisfying the criteria by 2008 Surviving Sepsis Campagin, Patients who are determined as having a sepsis within 24 hours of ICU stay

Exclusion Criteria:

• Do-not-resuscitate, cardiopulmonary resuscitation, ICU stay < 1 day, Refusal to participate in the study, Hematologic malignancy or liver cirrhosis (Child C), Congenital abnormality in coagulation system, Transfer from other ICUs or hospitals

Patients admitted to the ICU for severe sepsis or septic shock