Anemia, Iron & Blood Health

Anemia in Pregnancy: Normal Hemoglobin Levels, Symptoms and Treatment

By the Find Her Doctor editorial team · Updated November 1, 2026 · 6 min read

Anemia in pregnancy means your hemoglobin is lower than normal for your stage of pregnancy. ACOG and the CDC use a cutoff of 11 g/dL in the first and third trimesters, and 10.5 g/dL in the second. Most cases are iron deficiency, they're usually caught on routine prenatal blood work, and they're treatable with iron.

The tricky part is that anemia feels a lot like pregnancy. You're tired, you get winded on the subway stairs, your heart pounds a little. So many people don't realize anything is off until a lab result comes back. Here's what the numbers mean and what treatment is really like.

Why does anemia happen during pregnancy?

Your blood volume rises a lot in pregnancy. The liquid part of your blood (plasma) grows faster than your red blood cells, which naturally dilutes hemoglobin. That's why the "normal" range is lower in pregnancy, especially in the second trimester.

At the same time, your baby and placenta need iron to grow, and you're building extra red cells of your own. Many people start pregnancy with low iron stores already, often from heavy periods, a previous pregnancy not long ago, or a diet low in iron. When those stores run out, iron deficiency anemia sets in.

Less common causes:

• Folate or vitamin B12 deficiency
• Inherited hemoglobin conditions such as thalassemia trait or sickle cell disease
• Blood loss or chronic illness

What are normal hemoglobin levels in pregnancy?

These are the cutoffs ACOG uses. Your clinician reads your numbers alongside your symptoms, your red cell size and your iron levels, so one borderline value isn't a diagnosis on its own.

Is it anemia or just pregnancy? The symptoms

The overlap is real. Mention these at your next visit instead of writing them off:

• Feeling very tired or weak, more than you'd expect
• Shortness of breath beyond what's usual for you
• A fast or pounding heartbeat
• Dizziness or lightheadedness, especially standing up
• Pale skin, lips or nail beds
• Headaches
• Cravings for ice or non-food items (chewing ice is a classic one, and yes, people are often embarrassed to bring it up)
• Restless legs at night

How it's found: the blood tests

ACOG recommends a complete blood count (CBC) for everyone at the first prenatal visit and again later in pregnancy, typically around 24 to 28 weeks. That second check often happens on the same morning as your glucose test, so it's one trip to the lab.

If your hemoglobin is low, your provider may add:

• Ferritin, which shows your iron stores. The American Society of Hematology's 2026 guidelines suggest a ferritin of 30 ng/mL or lower indicates iron deficiency in pregnancy. More on that in what low ferritin means.
• Red cell size (MCV), which helps separate iron deficiency from other causes.
• Hemoglobin electrophoresis, a test for thalassemia or sickle cell trait, especially if your red cells are small but iron looks normal, or based on family background.
• Folate and B12, if red cells are large.

A common question: "Why is my doctor checking ferritin when the task force said screening isn't needed?" In 2024, the U.S. Preventive Services Task Force said there isn't enough evidence to judge routine iron screening or supplementation in pregnant people without symptoms. That doesn't change the standard CBC screening ACOG recommends, and it doesn't apply if you have symptoms or known anemia.

Does anemia in pregnancy affect the baby?

Mild anemia is common and usually manageable. Iron deficiency anemia, especially when it's more significant or shows up early, has been associated with:

• Preterm birth
• Low birth weight
• Greater need for a blood transfusion if there's heavy bleeding at delivery
• More fatigue and slower recovery after birth
• Postpartum depression

Your baby gets iron from you, so low maternal iron can also affect the baby's own iron stores. Treating anemia before delivery gives you a cushion if you bleed more than expected at birth.

What treatment is actually like

Iron pills: weeks 1 to 4

Most prenatal vitamins contain some iron. If you're diagnosed with iron deficiency anemia, your clinician will usually add a separate iron supplement. Ask exactly what to take and how often, and don't double up on your own.

What people notice in the first few weeks:

• Dark or black stools. Expected, and harmless.
• Constipation. The most common complaint, and pregnancy already slows your gut.
• Nausea. Worse for some people on an empty stomach.

Tips that often help (check with your provider first):

• Don't take iron at the same time as calcium, antacids, tea or coffee
• Ask whether a different form or schedule might be easier on your stomach
• Drink fluids and eat fiber for the constipation

Checking that it's working

Your provider will usually recheck your blood after a few weeks. If the numbers aren't moving, the next step is a conversation about why: are you able to take the pills, are you absorbing them, or is something else going on?

IV iron

If oral iron doesn't raise your levels, causes side effects you can't tolerate, or you're diagnosed late in pregnancy, your clinician may recommend IV iron. ACOG notes it can be considered in the second and third trimesters. It's given through an IV at an infusion center, usually over one or a few visits. Our guide to iron infusions during pregnancy walks through the appointment.

Other causes

If anemia is from folate or B12 deficiency, those vitamins are replaced. If you have a hemoglobin condition like sickle cell disease, you'll usually be co-managed by a maternal-fetal medicine specialist and a hematologist.

Questions worth asking at your next visit

• "What's my hemoglobin, and what's my ferritin?"
• "Should I take iron separately from my prenatal vitamin?"
• "When will you recheck my blood?"
• "If the pills don't work by then, what's the plan?"
• "Should my partner be tested for thalassemia or sickle cell trait?" (relevant if you carry a trait yourself)

When to call your provider

Call your prenatal care provider if you:

• Feel unusually tired, weak or short of breath
• Have a racing heartbeat or feel dizzy
• Can't tolerate your iron supplement
• Were told you're anemic and don't feel better after several weeks of treatment

Seek emergency care for chest pain, fainting, severe shortness of breath, or heavy vaginal bleeding.

If you don't have a prenatal provider yet, you can search for an OB/GYN or midwife near you, or start with a list like midwives in Queens. In New York, pregnant people may qualify for Medicaid pregnancy coverage, and NY Medicaid covers 12 months after pregnancy ends, which matters if anemia lingers after birth.

Seeing a hematologist in New York

Your OB/GYN or midwife may refer you to a hematologist if your anemia is severe, doesn't respond to oral iron, comes from an inherited blood condition, or you need IV iron. The hematologist works alongside your prenatal team; they don't replace it.

In the New York area, hematology care is available through hospital systems and community practices. Premier Hematology & Oncology, which sponsors our professional resources, offers hematology consults and IV iron infusions at centers in NYC, Long Island and the Hudson Valley. Clinicians can find details on our hematology partners page.

Frequently asked questions

Sources

• ACOG — Practice Bulletin 233: Anemia in Pregnancy
• CDC — Recommendations to Prevent and Control Iron Deficiency in the United States
• USPSTF — Screening and Supplementation for Iron Deficiency and Iron Deficiency Anemia During Pregnancy (2024)
• American Society of Hematology — Guidelines for the Diagnosis of Iron Deficiency (2026)
• ACOG — Committee Opinion 691: Carrier Screening for Genetic Conditions

This article is for general education and is not medical advice. It does not replace an evaluation by a licensed clinician who knows your history. If you think you have a medical emergency, call 911.