Initial laboratory studies include a complete blood count, blood type, Rh status, and coagulation studies including fibrin split products and fibrinogen to determine the presence of disseminated intravascular coagulation. Order radiographs based on fundamental principles of trauma management. However, shield the uterus when possible and limit radiographs to those that will significantly affect the patient's care. Adverse fetal effects from radiation are negligible from doses lower than 5 rad, which is an exposure far greater than that received from most plain radiographs. Radiation exposure from CT may be decreased by reducing the number of imaging cuts. Bedside ultrasonography is a highly sensitive, specific, and radiation-free alternative for imaging the abdomen. In addition to evaluating fetal heart rate, ultrasonography can assess gestational age, fetal activity or demise, placental location, and amniotic fluid volume. MRI has not been associated with adverse fetal outcomes. Diagnostic peritoneal lavage remains a valid modality for evaluating the pregnant abdominal trauma patient, though it has largely been replaced by ultrasonography. If it is indicated, use the open supraumbilical technique.