BACKGROUND Pregnant women in India are at higher risk of dying as compared to middle to high income countries. Deaths can be prevented if risk factors are identified, critical illness is diagnosed early and timely care is provided. The present research was undertaken to study the clinical profile and factors affecting the outcome of pregnant and postpartum patients in the Medical Intensive Care Unit (MICU). METHODS A total of 75 consecutive patients of age >18 years with confirmed pregnancy or postpartum females within 42 days from date of delivery requiring admission in ICU for at least one organ dysfunction as per APACHE II criteria1 were enrolled in the study. Clinical profiles of patients and outcomes were measured till hospital discharge. RESULTS Among 75 patients, 18(24%) patients were postpartum while 57(76%) were antepartum.The commonest symptom was fever (64%), followed by breathlessness (62.7%). Respiratory distress (58.7%) was the commonest indication for transfer to MICU. While 60(80%) patients were admitted for medical illnesses in pregnancy, 15(20%) patients were admitted for obstetric complications. Acute infections including malaria, dengue and leptospirosis were the commonest illness diagnosed in 19(25.3%) patients. Severity of illness measured using APACHE II score varied from 4 to 35 points with a mean score of 10.61.Longer duration of symptoms before seeking medical attention, lower pH, lower paO2/FiO2 ratio and serum bicarbonate, a diagnosis of tuberculosis and a higher APACHE II score were associated with a higher mortality. CONCLUSIONS With institution of intensive therapy in critically ill maternal patients, 80% of patients could be saved and 61% of fetuses had uneventful outcomes.The prognosis was better for obstetric illnesses than for medical illnesses with only 3 patients dying of obstetric causes whereas 12 patients died of medical illnesses common to the general population. Even though APACHE II score was higher in the group with obstetric conditions (mean=11 vs. 8.1), the mortality was lower.