Inferior vena cava (IVC) thrombosis is a life-threatening condition that is rarely diagnosed in the postpartum period. In the puerperal setting it is presumably the result of extension of clot from either the iliac or ovarian veins. Ultrasound has proven a valuable means of demonstrating deep venous thrombosis in pregnancy1-4. In the present case, postpartum IVC thrombosis was demonstrated using color flow Doppler ultrasound where the diagnosis was not suspected.