Late Postpartum Hemorrhage

The patient went home recovering well — then soaks through a pad every hour at day 10. Late postpartum hemorrhage catches families off guard because everyone assumed the danger had passed.

Late (secondary) postpartum hemorrhage occurs between 24 hours and 12 weeks after delivery, most commonly at 1–2 weeks postpartum. The leading cause is retained placental fragments — tissue left behind prevents the myometrium from contracting over the spiral arteries. Subinvolution of the placental site is the other major cause — the uterus fails to complete involution, leaving the area where the placenta attached open and bleeding. Infection at the placental site can also contribute by disrupting the healing process. The hallmark presentation is a return of heavy, bright red bleeding after lochia had already begun transitioning to serosa or alba. The fundus is often higher than expected for the postpartum day and may feel boggy. Assess vital signs for tachycardia and hypotension — these lag behind blood loss, so a rising heart rate with normal BP is an early warning. Nursing interventions include fundal massage if the uterus is boggy, IV oxytocin or methylergonovine as ordered, monitoring pad counts and weighing pads (1 g = 1 mL blood loss), and preparing the patient for possible ultrasound to identify retained tissue. Methylergonovine is contraindicated in hypertension. If retained fragments are confirmed, the patient may need uterine curettage. Teach all postpartum patients before discharge that returning bright red bleeding, passage of clots, or foul-smelling lochia warrants immediate evaluation.

Key Distinctions

Don't confuse late PPH (>24 hours, subinvolution or retained fragments) with early PPH (<24 hours, uterine atony or lacerations) — the causes and timing differ. Students mistake the normal brief return of red lochia with increased activity for late hemorrhage; true late PPH involves sustained heavy bleeding with clots, not a transient pink tinge. Foul-smelling lochia with fever points toward endometritis (sibling atom: postpartum infections), not uncomplicated late PPH.

Clinical Pearl

Lochia should progress rubra (red) → serosa (pink) → alba (white). Any reset back to bright red after lochia has transitioned beyond rubra, especially with clots, is guilty until proven innocent.