ArticleInternational journal of women's health2026
Hemoglobin Trajectory During Pregnancy and Postpartum Hemorrhage: A Retrospective Cohort Study.
Article in International journal of women's health, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
0 citing papers in PubMed.
No citing paper in PubMed yet.
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
6 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Background: Studies on the association between anemia and postpartum hemorrhage (PPH) mostly use the hemoglobin (Hb) levels in a single trimester, thereby failing to capture the dynamic changes of Hb levels during pregnancy. This study aims to assess the trajectories of Hb during pregnancy and evaluate their association with PPH. Methods: The study population consisted of 4296 women who gave birth in a tertiary hospital after 28 weeks of gestation between January 2024 and February 2025. Group-based trajectory modelling was used to identify hemoglobin trajectories. Logistic regression models were applied for evaluating the associations between hemoglobin trajectories and PPH. Results: Three trajectories of maternal Hb were identified. In trajectory 1 (decline-stable, 20.41%), maternal Hb levels were higher than those in trajectory 2 in the first trimester, and rapidly declined across pregnancy with the lowest point at 35 weeks. In trajectory 2 (decline-rise, 73.16%), maternal Hb decreased during the first and second trimesters, and slightly increased during the third trimester. In trajectory 3 (stable-rise, 6.42%), maternal Hb remained stable in early and mid-pregnancy and increased in late pregnancy. Compared with trajectory 2, trajectory 1 was associated with a 2.36-fold higher risk of PPH (95% CI: 1.59-3.47), while trajectory 3 showed no significant association (OR: 0.79, 95% CI: 0.27-1.81), after adjustment. The area under the receiver operating characteristic curve was 0.74 (95% CI: 0.70-0.79). Compared with women with Hb ≥116 g/L at 28-32 weeks, women with Hb <116 g/L had a 1.64-fold higher risk of PPH (95% CI: 1.08-2.52). Conclusion: Women who are not anemic in early pregnancy but experience a rapid decline in Hb during pregnancy, especially those with Hb <116 g/L in the early third trimester, are at high risk for PPH.
Indexed as
Identifiers
What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.