The significance of precipitating causes of acute disseminated intra-vascular coagulation (DIC) and the severity of derangement of haemostasis based on laboratory investigations carried out initially were evaluated in 98 patients and was related to the fatal outcome in them. It was seen that septicaemia was the commonest precipitating cause. Survival was better in patients in whom DIC was precipitated by obstetric causes compared with those with septicaemia (P < 0.01). Death was also more frequently associated in patients with higher prothrombin time (PPT) ratio (> 1.5) and/or higher activated partial thromboplastin time (APTT) ratio (> 2.5) as compared to their lower values (P < 0.01 each). Death occurred in all the seventeen patients in whom septicaemia was present along with PPT ratio of > 1.5. It is concluded that deranged haemostasis and presence of septicaemia both independent of each other, contribute to the fatal outcome in acute DIC. Combination of both is associated with poorest prognosis.