Maternal sepsis kills postpartum women because pregnancy's normal vital sign changes mask the early warning signs of infection

A postpartum woman's heart rate is normally elevated. Her blood pressure is normally lower. Her white blood cell count is normally higher than a non-pregnant person's. These are the exact same vital sign changes that indicate early sepsis. When a postpartum woman develops an infection — endometritis after cesarean delivery, a urinary tract infection that spreads, or chorioamnionitis that was not fully resolved — the earliest signs of sepsis (tachycardia, hypotension, leukocytosis) are written off as normal postpartum physiology. By the time the infection is clinically obvious, the patient is in septic shock. Maternal sepsis is a leading preventable cause of maternal death. The diagnostic coding problem alone reveals how poorly we identify it: when used retrospectively, obstetric infection codes have only a 20.3% positive predictive value for identifying maternal sepsis. That means the medical system cannot even accurately count how many postpartum women develop sepsis, let alone catch it early. Often there is no obvious source of infection, which compounds the challenge — a woman with worsening tachycardia and low-grade fever postpartum may not have an apparent wound infection or urinary symptoms, and the provider defaults to 'she's just recovering from delivery.' The California Maternal Quality Care Collaborative developed a two-step screening tool (an obstetrically-modified SIRS criteria followed by end-organ dysfunction evaluation) that significantly improves sepsis detection in postpartum patients. But adoption of this screening tool is far from universal. Most hospitals still use standard sepsis screening criteria that were developed for the general population and do not account for the altered physiology of pregnancy and postpartum. The structural issue is that maternity wards are staffed and organized for delivery, not for managing acute medical emergencies like sepsis. Nursing ratios on postpartum floors are designed for recovery, not for the frequent vital sign monitoring that early sepsis detection requires. The infection simmers undetected for hours or days until the patient crashes.