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Is Treating Early Anemia Enough? Key Outcomes & Resolution Impact

•Posted inObstetrics and Gynaecology

A new analysis provides crucial data regarding the risk of adverse pregnancy outcomes associated with first trimester anemia. Furthermore, this study evaluates the impact of anemia resolution versus its persistence by late pregnancy. The findings suggest that early and pre-pregnancy treatment is vital for improving maternal and neonatal health.

Higher Risks Linked to First Trimester Anemia

Researchers analyzed claims data from over 73,000 pregnant individuals between 2018 and 2023. They identified first trimester anemia in 4.4% of the cohort. In fact, this early diagnosis was associated with a higher risk for nearly all poor maternal and neonatal outcomes assessed. Consequently, the greatest risk was a two-fold increase in the need for blood product transfusion (Adjusted Risk Ratio [aRR] 2.45). Other outcomes included preeclampsia, placental abruption, severe postpartum hemorrhage (PPH), and small-for-gestational-age (SGA) birth weight.

Anemia Resolution by Late Pregnancy

The study focused on the 72.1% of patients with early anemia who had laboratory follow-up. About 46.6% of these women achieved anemia resolution by late pregnancy. However, 53.4% had persistent anemia. Comparing persistent anemia against no first-trimester anemia, the persistence group showed a significantly higher risk of non-transfusion severe maternal morbidity (SMM), blood transfusion, and SGA birth weight. In contrast, the resolution group showed different results.

Impact of Anemia Resolution on SMM

While persistent anemia was associated with non-transfusion SMM (aRR 1.64), the resolution of anemia by late pregnancy appeared to eliminate this specific risk (aRR 1.07). Therefore, treating anemia aggressively during the first trimester substantially reduced the risk of non-transfusion SMM. However, even with resolution, women still faced an increased risk of blood products transfusion (aRR 1.64) and SGA birth weight (aRR 1.38) compared to women who never had anemia. This highlights the ongoing risk of complications despite successful treatment later in gestation.

Clinical Relevance for Indian Practice

First trimester anemia is a critical public health issue in India, where prevalence rates often range between 65% and 75%. In fact, maternal anemia is responsible for about 20% of total maternal deaths in India. Consequently, Indian studies also link maternal anemia to a higher risk of PPH, preterm delivery, and low birth weight. Therefore, early screening in the first trimester is highly important, especially since routine screening is often recommended at the start of prenatal care.

Screening and Treatment Modalities

The initial evaluation for a pregnant patient with anemia should include a complete blood count, red blood cell indices, and ferritin levels. Furthermore, oral iron is the frontline therapy, but physicians must monitor compliance and response to treatment. Moreover, intravenous (IV) iron therapy is recommended for women with severe anemia, poor tolerance for oral iron, or in the third trimester for a rapid response. The overall goal is prevention; hence, healthcare programs should prioritize preconceptional and early pregnancy interventions.

Frequently Asked Questions

Q1: What is the most significant risk associated with first trimester anemia?

The study found the highest associated risk was the need for blood products transfusion, with an adjusted risk ratio (aRR) of 2.45 compared to women who did not have anemia in the first trimester.

Q2: Does resolving anemia by late pregnancy eliminate all risks?

No. While resolution eliminated the association with non-transfusion Severe Maternal Morbidity (SMM), it did not eliminate the increased risk for blood products transfusion or small-for-gestational-age (SGA) birth weight compared to women without early anemia.

Q3: Why is treating anemia in the first trimester crucial?

Early treatment is crucial because it significantly reduces the risk of non-transfusion SMM later in pregnancy. Furthermore, the findings emphasize the need for pre-pregnancy and early pregnancy intervention to mitigate adverse maternal and neonatal outcomes, which are associated with the condition.

References

  1. Booman A et al. Pregnancy Outcomes Associated With Anemia in the First Trimester and Anemia Resolution by Late Pregnancy. Obstet Gynecol. 2026 Feb 06. doi: 10.1097/AOG.0000000000006183. PMID: 41643193.
  2. Incidence of anemia in pregnancy and its maternal-fetal outcome in admitted ANC patients in tertiary care center, Bhilai, Ch. IJRCog. Published April 1, 2021.
  3. Anemia in pregnancy: A case control study from India. Researcher.Life. Published April 7, 2023.
  4. Association between maternal anaemia and pregnancy outcomes: a cohort study in Assam, India. PMC – NIH.
  5. Ensuring successful treatment of anemia in pregnancy. Contemporary OB/GYN. Published October 14, 2024.
  6. Screening and Treatment of Obstetric Anemia: A Review of Clinical Effectiveness, Cost-Effectiveness, and Guidelines. NIH. Published December 6, 2019.