Iron Deficiency in Pregnancy: Treatment Options in the UK

Pregnancy is exhausting enough without iron deficiency making it worse. If you're pregnant and struggling with fatigue that goes beyond normal pregnancy tiredness: if the brain fog, breathlessness, or heart palpitations are making daily life difficult: iron deficiency may be the reason.

You're not alone. Up to 40% of pregnant women in the UK are iron deficient. Here's what you need to know about why it happens, what the risks are, and what treatment options are available.

Why iron deficiency is so common in pregnancy

Your iron requirements increase dramatically during pregnancy. Your body needs extra iron to:

• Expand your blood volume: blood volume increases by approximately 50% during pregnancy, requiring significantly more haemoglobin
• Support placental development: the placenta requires iron for proper growth and function
• Supply your baby: your baby depends entirely on your iron stores for their own development, particularly for brain growth in the third trimester
• Prepare for blood loss at delivery: your body needs adequate iron reserves to cope with the blood loss that occurs during birth

The total additional iron required during pregnancy is approximately 1,000mg. If you entered pregnancy with low or borderline iron stores: which is common, especially if you have heavy periods: your body simply can't keep up through diet alone.

Symptoms to watch for

Many symptoms of iron deficiency overlap with normal pregnancy symptoms, which is why it's often missed or dismissed:

• Extreme tiredness: beyond normal pregnancy fatigue. The kind of exhaustion where getting dressed feels like a major achievement.
• Breathlessness: feeling short of breath during light activity, like climbing stairs or talking while walking
• Heart palpitations: your heart working harder to compensate for fewer oxygen-carrying red blood cells
• Dizziness or lightheadedness: particularly when standing up
• Difficulty concentrating: brain fog that goes beyond "pregnancy brain"
• Pale skin, lips, or nail beds
• Restless legs: especially at night

If your midwife or GP tells you "that's just pregnancy," but your gut tells you something is off: trust yourself. A blood test can confirm whether iron deficiency is a factor.

The risks of untreated iron deficiency in pregnancy

This isn't just about how you feel. Maternal iron deficiency anaemia is associated with real risks:

For you:

• Increased fatigue and reduced quality of life during pregnancy
• Higher risk of requiring a blood transfusion during or after delivery
• Increased risk of postpartum depression
• Slower recovery after birth

For your baby:

• Increased risk of preterm birth
• Increased risk of low birth weight
• Risk of neonatal iron deficiency: your baby's iron stores at birth depend on yours
• Iron is critical for fetal brain development, particularly in the third trimester

These risks are well-documented in clinical literature. This is why NICE guidelines recommend routine iron screening at booking and again at 28 weeks.

Treatment options

Oral iron (tablets)

Your GP or midwife will almost certainly try oral iron first. This is standard protocol and works for many women. The usual prescription is ferrous sulphate or ferrous fumarate, taken daily.

The challenges during pregnancy:

• GI side effects are worse during pregnancy: nausea and constipation from iron tablets on top of pregnancy nausea can be miserable
• Absorption is limited: your gut absorbs approximately 10% of each dose, and pregnancy itself can reduce absorption further
• Speed: tablets take 3-6 months to restore iron levels. If you're diagnosed at 28 weeks, there aren't 3-6 months left
• Compliance: between the side effects and the timing requirements (empty stomach, away from calcium), many pregnant women stop taking them

If oral iron is working for you and you can tolerate it, that's genuinely good. Keep going. But if it isn't: there's another option.

Iron infusion (IV iron)

An iron infusion delivers iron directly into your bloodstream, bypassing your gut entirely. A single session can deliver up to 1,000mg of iron: the equivalent of months of tablets.

IV iron infusions are regularly used in NHS hospitals for pregnant women with iron deficiency anaemia, particularly when:

• Oral iron hasn't raised haemoglobin or ferritin levels
• GI side effects make oral iron intolerable
• The diagnosis comes late in pregnancy (third trimester) and there isn't time for oral iron to work
• Haemoglobin is significantly low and needs to be raised before delivery

Safety of iron infusions during pregnancy

Ferric carboxymaltose is widely used for pregnant women in the second and third trimesters across NHS hospitals. It's considered safe and effective when oral iron has failed or isn't appropriate.

Second and third trimester: IV iron infusions are established clinical practice. Multiple studies and NICE guidance support their use in pregnancy.

First trimester: Treatment is generally avoided as a precaution. Safety data in the first trimester is more limited, and most clinicians prefer to wait until after 13 weeks unless there's an urgent clinical need.

At IronOx Clinic, Dr. Ros will assess your specific situation: your gestation, blood results, symptoms, and medical history: before recommending treatment. She won't suggest an infusion unless it's clinically appropriate for both you and your baby.

When to consider an infusion during pregnancy

An iron infusion may be the right step if:

• You've tried oral iron and it hasn't worked: your ferritin or haemoglobin hasn't improved after weeks of supplementation
• You can't tolerate tablets: the nausea on top of pregnancy sickness is unbearable
• You're in the third trimester: and there isn't enough time for oral iron to work before delivery
• Your haemoglobin is significantly low: below 100 g/L, where the risks of anaemia at delivery become more serious
• You have an underlying condition: coeliac disease, IBD, or other malabsorption conditions that prevent oral absorption

The NHS route vs private

On the NHS, getting an iron infusion during pregnancy typically requires:

1. Your GP or midwife to identify the anaemia
2. A referral to haematology or the antenatal day unit
3. Waiting for an appointment: which can take weeks, even on a "priority" pathway

For some women, this timeline works. But if you're 32 weeks pregnant, severely anaemic, and facing a wait of several weeks for treatment: that's time you may not have.

At IronOx Clinic, no referral is needed. Appointments are available within days. The treatment is the same: ferric carboxymaltose, the NICE-recommended IV iron: administered by a specialist doctor.

Read our full NHS vs private comparison for more detail on costs and access.

What to do now

If you're pregnant and think you might be iron deficient:

1. Ask for a blood test: request ferritin and full blood count from your GP or midwife, or book a ferritin blood test in Cardiff. If you already have recent results, check the actual numbers, not just whether they're flagged as "abnormal."
2. If tablets aren't working, don't just keep taking them and hoping. Talk to your GP about alternatives: or book a consultation with Dr. Ros for a specialist assessment.
3. Don't delay: iron deficiency in pregnancy doesn't improve on its own, and the risks increase as pregnancy progresses. The earlier it's addressed, the better the outcomes for both you and your baby.

Every pregnancy is different, and treatment decisions should be made with your full clinical picture in mind. Dr. Ros will assess your individual situation and recommend the most appropriate path: whether that's an infusion or something else.

Sources

• British Society for Haematology, UK guidelines on the management of iron deficiency in pregnancy (2020): the UK specialist guideline on preventing, diagnosing and treating iron deficiency in pregnancy and the postpartum period.
• NICE, Antenatal care (NG201): the antenatal schedule, including the points at which haemoglobin is checked in pregnancy.
• NHS, Iron deficiency anaemia: the NHS overview of symptoms, the full blood count used to diagnose it, and the pathway of establishing the cause before treating with iron tablets.

Medically reviewed by Dr Rukhsana Jabar ("Dr Ros"), GMC-registered doctor (GMC 7265326).

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