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Intravenous versus oral iron in pregnancy: the FER-ASAP comparison

More women reached the trial’s anemia-correction threshold with intravenous treatment. This was a supervised treatment comparison.

Read the evidence ↓

Supplement Science Insights Editorial Team

Published September 23, 2026

The study and its comparison

FER-ASAP randomized 252 women with iron-deficiency anemia at 16–33 weeks of pregnancy to intravenous ferric carboxymaltose or oral ferrous sulfate for twelve weeks. [1]

Anemia correction occurred in 84 percent versus 70 percent, with median times of 3.4 versus 4.3 weeks. Gastrointestinal adverse events were more common with oral treatment, and reported newborn characteristics were similar. [1]

What the finding establishes

The open-label design and specific pregnancy setting limit generalization. Similar newborn characteristics do not establish absence of every uncommon risk. Funding and conflicts were not established from the abstract. The findings do not make an infusion a self-selected alternative to routine prenatal care. [1]

A hypothetical distinction

Imagine one route reaches a laboratory threshold sooner. Route choice still requires the clinical setting and treatment risks.

Interpretation checklist — Intravenous versus oral iron in pregnancy
DetailInterpretation
Measured outcomeKeep the endpoint specific
Study preparationNot every retail product
Remaining uncertaintyNot resolved by a mechanism
Intravenous versus oral iron in pregnancy: the FER-ASAP comparison — original article outline diagram
Original editorial diagram of this article’s sections; no product photograph or clinical finding is depicted.

Sources for this article

  1. Ferric carboxymaltose vs. oral iron in the treatment of pregnant women with iron deficiency anemia: an international, open-label, randomized controlled trial (FER-ASAP).
    Source consulted: 2026-09-19. This is a reference resource, not a claim that we conducted the studies or tested a product.