Abruptio placentae, or placental abruption, is the premature separation of a normally implanted placenta from the uterine wall before the fetus is delivered. It occurs in approximately 1% of pregnancies and is a leading cause of third-trimester fetal death, carrying a perinatal mortality of roughly 10 to 20 percent. Because separation interrupts the maternal-fetal exchange of oxygen and nutrients and can cause rapid maternal blood loss, abruption is an obstetric emergency that demands swift recognition and response. The classic presentation is painful, dark-red vaginal bleeding accompanied by a firm, tender, often board-like uterus. This pain-and-rigidity picture is the key feature distinguishing abruption from the painless, bright-red bleeding of placenta previa. Importantly, about 20% of abruptions are concealed, meaning blood is trapped behind the placenta and there is little or no external bleeding even though significant hemorrhage and fetal compromise are occurring; in these cases severe abdominal pain and a non-reassuring fetal heart rate may be the only clues. Abruption is graded by severity from mild (Grade 1) with minimal bleeding and no distress, to moderate (Grade 2) with uterine tenderness...