Mild Thrombocytopenia and the Risk of Post-Partum Hemorrhage.
Chen Nahshon, Ilana Grach, Eiman Shalabna et al.
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In 30 seconds
This systematic review and meta-analysis assessed whether mild thrombocytopenia in pregnancy is associated with postpartum hemorrhage (PPH), using observational studies identified through searches up to April 8, 2025. Eight retrospective studies included 79 126 women, 9496 of whom had mild thrombocytopenia. Mild thrombocytopenia was associated with higher odds of PPH (OR 1.68; 95% CI 1.25-2.26; I 2 = 89%). Associations were also reported for blood transfusion and a hemoglobin decline ≥ 3 g/dL. The findings indicate association, not causation.
Key findings
- Across eight retrospective studies, mild thrombocytopenia was associated with PPH (OR 1.68; 95% CI 1.25-2.26; I 2 = 89%).
- Mild thrombocytopenia was associated with blood transfusion (OR 1.47; 95% CI 1.11-1.97).
- The odds of hemoglobin decline ≥ 3 g/dL were higher with mild thrombocytopenia (OR 1.56; 95% CI 1.03-2.36).
Why it matters
The findings challenge the assumption that mild thrombocytopenia in pregnancy is invariably benign with respect to bleeding. Its association with PPH and related outcomes suggests it may be a useful risk marker in peripartum assessment, while the high heterogeneity and retrospective evidence mean the magnitude and clinical implications remain uncertain.
What to keep in mind
All included studies were retrospective, and heterogeneity for the PPH association was high (I 2 = 89%). The evidence does not establish causality; prospective studies with standardized PPH definitions are needed.