What it is
The four main causes are the '4 Ts': Tone (uterus doesn't contract down — most common), Trauma (tear or laceration), Tissue (retained placenta), and Thrombin (clotting problem). Standardized bundles from the AIM (Alliance for Innovation on Maternal Health) and CMQCC (California) programs have every unit start with the same steps: massage, second uterotonic, IV access, blood work, and clear escalation to balloon tamponade (Bakri), tranexamic acid, and OR if needed. Risk factors include prior PPH, prolonged labor, chorioamnionitis, high parity, twins, big baby, Pitocin induction, and cesarean.
Evidence review links
Each link opens the full review on the publisher's site in a new tab.
- AIM Patient Safety Bundle: Obstetric HemorrhageAlliance for Innovation on Maternal Health
- CMQCC Obstetric Hemorrhage ToolkitCalifornia Maternal Quality Care Collaborative
- WHO recommendations for the prevention and treatment of postpartum haemorrhageWHO
- Effect of early tranexamic acid administration on mortality, hysterectomy, and other morbidities in women with post-partum haemorrhage (WOMAN trial)The Lancet
- ACOG Committee Opinion 736: Optimizing Postpartum CareACOG
- Hear Her — Urgent Maternal Warning SignsCDC
Possible benefits
- Standardized hemorrhage bundles have measurably reduced severe maternal outcomes in the U.S.[Alliance for Innovation on Maternal Health↗][California Maternal Quality Care Collaborative↗]
- Prophylactic oxytocin, uterine massage, and quick uterotonic escalation stop most PPH before it becomes severe[WHO↗]
- Tranexamic acid within 3 hours of PPH reduces death from bleeding (WOMAN trial)[The Lancet↗]
- Balloon tamponade (Bakri) and uterine artery embolization save uteruses that used to require hysterectomy[California Maternal Quality Care Collaborative↗]
Possible risks
- Blood transfusion, ICU admission, hysterectomy, and — rarely — death when PPH is missed or delayed[Alliance for Innovation on Maternal Health↗]
- Emotional impact is often underestimated — hemorrhage doubles postpartum PTSD risk; debrief and screen[ACOG↗]
- Delayed / secondary PPH (24 hours to 12 weeks) can present as a sudden gush of bright red blood at home — see 'call your care team'[CDC↗]
Alternatives
- Ask ahead of time whether your unit has an AIM/CMQCC hemorrhage bundle and rapid-transfusion protocol[Alliance for Innovation on Maternal Health↗]
- If you had a prior PPH, ask for a written 'high risk' plan for this birth (2nd IV, type & screen, uterotonics at bedside)[WHO↗]
- Consider iron optimization in pregnancy to make severe blood loss more survivable[ACOG↗]
Current evidence
AIM's Obstetric Hemorrhage Safety Bundle and California's CMQCC toolkit are the U.S. standard. The WOMAN trial (2017) showed tranexamic acid within 3 hours reduces mortality from PPH.
Where the evidence is clear · where people may choose differently
For most topics, guidelines from ACOG, WHO, and other major bodies broadly agree on the core safety points (when to act in an emergency, informed-consent standards, monitoring baselines). Where reasonable people — and even guidelines — differ tends to be around thresholds (when to start or stop something), preferences (comfort, environment, support), and values (how you weigh small risks against benefits). Use the questions below to explore those pieces with your care team.
Educational only. Your care team can help you weigh what applies to your specific situation.
Related evidence topics
- Active vs. Physiologic Management of the Third StageAfter the baby is born, the placenta still has to come out. 'Active management' uses a Pitocin injection plus controlled cord traction; 'physiologic' or 'expectant' management waits for your body to do it on its own. Active reduces heavy bleeding; physiologic keeps the space quieter.
- Pitocin After Birth (Third Stage of Labor)A dose of synthetic oxytocin often offered after baby is born to help the uterus contract as the placenta is delivered.
- Delivering the PlacentaThe placenta usually comes out on its own within 5–30 minutes after the baby, with a small gush of blood and a mild contraction. What signs mean it's ready, what your team is watching for, and what to expect physically.
- Uterine (Fundal) MassageFirm pressure and kneading on the top of the uterus after birth to help it clamp down on the blood vessels where the placenta was attached. Uncomfortable but important — it's a core piece of hemorrhage prevention.
- Cesarean RecoveryThe first hours, days, and weeks after a cesarean — pain management, incision care, moving, feeding, and when to call. Modern ERAS (Enhanced Recovery After Surgery) protocols get most people up walking within 24 hours.
- Normal Variations in Labor and the First DaysA running list of things that surprise or worry many people but are usually within the normal range — so you know what's expected and what's worth calling about.
Questions to ask your care team
- ?What are my personal PPH risk factors, and does that change the plan?
- ?Does your unit have an AIM or CMQCC hemorrhage bundle in place?
- ?If I have a history of PPH, what specifically will be different this time?
- ?How much bleeding is 'normal' postpartum for me — and when should I call?
- ?Can we schedule a debrief in the first weeks after if a hemorrhage happens?
Universal questions (works for any decision)
A short BRAIN-style set you can bring to any conversation about interventions, monitoring, or care decisions.
- ?Why are you recommending this now — is it urgent, routine, or optional?
- ?What happens if we wait an hour (or longer) before deciding?
- ?What signs would tell us this is working — or that we need to change course?
- ?What are the alternatives, including doing nothing?
- ?What would you recommend if this were your family?
- ?What would change your recommendation?
Sources & provenance
Tap a source to open the original guideline or review in a new tab.
- AIM Patient Safety Bundle: Obstetric Hemorrhage — Alliance for Innovation on Maternal Health
- CMQCC Obstetric Hemorrhage Toolkit — California Maternal Quality Care Collaborative
- WHO recommendations for the prevention and treatment of postpartum haemorrhage — WHO
- Effect of early tranexamic acid administration on mortality, hysterectomy, and other morbidities in women with post-partum haemorrhage (WOMAN trial) — The Lancet
- ACOG Committee Opinion 736: Optimizing Postpartum Care — ACOG
- Hear Her — Urgent Maternal Warning Signs — CDC
Plain-language paraphrase. Re-verify before publish.
Last reviewed: 2026-07-03
Further reading — canonical references
Read the source material directly. Each link opens the publisher's own current guidance in a new tab — cross-check what we summarize against what they say.
Tier 1 · Clinical guidelines
Tier 2 · Systematic reviews
Educational only. Guidelines evolve — the linked publisher pages will reflect newer guidance than any static snapshot.
Version history — v1.0.0
v1.0.0 · 2026-07-03 · LlaMamma editors
Initial postpartum hemorrhage topic.
New guidance from ACOG, WHO, Evidence Based Birth, or other listed sources is recorded here and can be updated remotely without a new app release.