Iron in Pregnancy mg per day

Iron in Pregnancy: Daily Intake Guide

A pregnant body needs about twice as much iron as usual. The extra goes toward the expanding maternal blood volume, the growing placenta, and the fetus building its own red blood cells. That is why the NIH Recommended Dietary Allowance (RDA) climbs to 27 mg/day for the whole pregnancy, against the 18 mg/day suggested for adult women who are not pregnant.

Once iron-deficiency anemia shows up (hemoglobin below 11 g/dL in the first or third trimester, or below 10.5 g/dL in the second), the usual treatment is 40–60 mg/day of elemental iron, most often as ferrous sulfate. Where that iron comes from matters. Heme iron in meat, poultry, and fish absorbs at around 15–35%; the non-heme iron in beans, dark leafy greens, and fortified flour lags far behind at 2–20%. Vitamin C from citrus or peppers gives non-heme absorption a real boost, whereas tea, coffee, and calcium drag it down.

Applications

Obstetricians, nutritionists, family doctors, and SUS primary-care teams use figures like these when guiding prenatal supplementation under the PNSF (Programa Nacional de Suplementacao de Ferro), the program that hands out ferrous sulfate free of charge to pregnant women. Vegetarian and vegan mothers-to-be can also lean on it when building meal plans that squeeze more absorption out of plant sources.

FAQ

Why does iron cause nausea or constipation? A big dose of elemental iron irritates the stomach lining and slows things down in the gut. It usually helps to take it with food, break the dose into smaller portions, or move to ferrous bisglycinate, which tends to sit better. Talk to your doctor before changing anything.

Should I take iron together with calcium? Better not to. The two compete for absorption. Leave at least 2 hours between an iron supplement and a calcium one, and keep iron away from milk, coffee, or tea.

Is this calculator a medical prescription? No. Treat it as an educational reference drawn from NIH, WHO, and Ministry of Health guidelines. The actual dose and how long to take it are decisions for your obstetrician, made after looking at your hemoglobin, ferritin, and overall clinical picture.