Iron Deficiency and Iron Infusions: What a Hematologist Wants You to Know

You have been exhausted for months. Not the kind of tired that a good night’s sleep fixes, but a heaviness that sits behind your eyes all day, slows your thinking, and follows you no matter how early you go to bed. Your doctor ran blood work. Maybe you were told everything looked normal. Maybe you were handed a bottle of iron tablets that left you constipated and nauseous without actually helping your energy.

If that sounds familiar, you are not alone. Iron deficiency is one of the most common nutritional deficiencies worldwide, and it is frequently misunderstood, underdiagnosed, or undertreated. As a board-certified hematologist, I see patients every week who have spent months cycling through fatigue, supplements, and frustration before getting clear answers.

This article walks through what iron deficiency actually looks like, why it is more complicated than a single blood test, what happens when oral iron is not enough, and how iron infusion therapy works from start to finish.

More Than Just Tired

Most people connect iron deficiency with fatigue. That connection is real, but it is only part of the picture. Iron plays a role in oxygen transport, energy metabolism, neurotransmitter production, and even hair follicle function. When iron stores drop, the effects show up in places patients do not expect.

The Symptoms Most People Miss

Fatigue gets the most attention, but patients with iron deficiency commonly report:

• Brain fog and difficulty concentrating. Iron supports the production of dopamine and other neurotransmitters. When iron is low, cognitive sharpness suffers.
• Hair thinning or increased shedding. Hair follicles are sensitive to ferritin levels. Many patients notice more hair in the drain months before a lab test catches the problem.
• Restless legs, especially at night. The urge to move your legs when lying down is strongly associated with low iron, even when hemoglobin levels remain in the normal range.
• Brittle or spoon-shaped nails. Nails that crack, peel, or develop a concave curve can signal depleted iron stores.
• Cold hands and feet. Reduced oxygen-carrying capacity affects circulation to the extremities.
• Pica (unusual cravings). Craving ice, dirt, or starch is a recognized symptom of iron deficiency. Patients often feel embarrassed to mention it, but it is clinically significant.
• Shortness of breath with mild exertion. Walking up a flight of stairs should not leave you winded. If it does, iron may be part of the reason.

These symptoms do not always appear together, and they overlap with many other conditions. That overlap is exactly why iron deficiency goes unrecognized for so long. The symptoms build gradually, which makes them easy to normalize or blame on stress, aging, or poor sleep.

Iron Deficiency vs. Iron Deficiency Anemia

This distinction matters more than most patients realize.

Iron deficiency anemia (IDA) means your iron stores are depleted AND your hemoglobin has dropped below normal. Your body no longer has enough iron to produce healthy red blood cells. A standard complete blood count (CBC) will usually catch this because hemoglobin shows up as low.

Iron deficiency without anemia (IDWA) means your iron stores are low, but your hemoglobin is still in the normal range. Your body is compensating, drawing from reserves to keep red blood cell production going. A CBC alone may look perfectly fine.

Here is the problem: a routine CBC does not measure iron stores. To assess iron status accurately, your doctor needs to check ferritin (a protein that reflects stored iron), transferrin saturation, and total iron-binding capacity (TIBC). Without these tests, iron deficiency can look invisible on paper while causing real symptoms.

When Your Hemoglobin Is Normal but Your Iron Is Not

IDWA affects roughly twice as many people as iron deficiency anemia. That number is striking, and it means a large population of patients is walking around with symptoms, low ferritin, and lab reports that technically read as “normal.”

This is one of the most underrecognized patterns I see in practice. A patient reports fatigue, brain fog, and hair loss. Blood work comes back with a normal hemoglobin. The conversation ends with “your labs look fine,” and the patient leaves without answers.

But ferritin tells a different story. Clinical research has shown that symptoms of iron deficiency can appear well before hemoglobin drops. If your ferritin is low, you may be symptomatic regardless of what your CBC says.

This is why a hematologist’s evaluation goes deeper than a standard blood panel. When a patient presents with these symptoms and a ferritin level that does not match what they are feeling, that gap deserves investigation, not dismissal.

Why Oral Iron Does Not Work for Everyone

Oral iron supplements are the most commonly prescribed first-line treatment for iron deficiency. For some patients, they work well. For others, they create a new set of problems without solving the original one.

There are several reasons oral iron may fall short:

GI side effects. Constipation, nausea, stomach cramps, and dark stools are common with oral iron. These side effects cause many patients to reduce their dose or stop taking supplements altogether, which limits how much iron actually gets absorbed.

Poor absorption. The body absorbs only a small fraction of the elemental iron in most oral supplements, typically around 10 to 15 percent on an empty stomach and even less when taken with food. Patients with celiac disease, inflammatory bowel disease (IBD), or a history of gastric bypass surgery may absorb significantly less due to damage or changes to the absorptive lining of the small intestine.

Ongoing blood loss. For patients with heavy menstrual bleeding, chronic GI blood loss, or frequent blood draws, the rate of iron loss may exceed what oral supplements can replace. In those situations, oral iron is fighting a losing battle.

Medication interactions. Common medications, including proton pump inhibitors (PPIs), antacids, and certain antibiotics, can reduce iron absorption. Patients who take these regularly may not get the benefit they expect from oral supplements.

When oral iron is not tolerated, not absorbed, or not keeping up with the body’s demands, the conversation shifts to intravenous iron.

Who Should Consider an Iron Infusion

Iron infusions deliver iron directly into the bloodstream, bypassing the GI tract entirely. This makes them a practical option when oral iron therapy has not worked or is not appropriate.

Your doctor may recommend an iron infusion if you:

• Cannot tolerate oral iron due to GI side effects
• Have a malabsorption condition that limits oral iron uptake
• Have ongoing blood loss that oral supplementation cannot match
• Need rapid iron repletion (for example, before a scheduled surgery or during pregnancy)
• Have confirmed iron deficiency that has not responded to an adequate trial of oral iron
• Have chronic kidney disease and are receiving erythropoiesis-stimulating agents

A hematologist can help determine whether an infusion is the right approach based on your lab results, symptoms, medical history, and the underlying cause of your iron deficiency. At Brodsky Hematology, iron infusion services are available at a dedicated infusion clinic in addition to the primary Pikesville office.

What Happens During an Iron Infusion

Procedural anxiety is normal. Most patients feel more at ease once they know what the appointment actually looks like.

Before the Infusion

Your hematologist will review your labs (ferritin, hemoglobin, transferrin saturation) and confirm that IV iron is appropriate for your situation. You may be asked about allergies, current medications, and prior reactions to IV medications.

On the day of your infusion, eat a normal meal and stay well hydrated. Wear a shirt with sleeves that roll up easily. Bring something to read or watch. You will be seated for a portion of the appointment.

During the Infusion

A nurse will place a small IV catheter, usually in your hand or forearm. The iron is diluted in a saline solution and delivered through the IV over a period that typically ranges from 15 to 60 minutes, depending on the specific formulation and dose your doctor has selected.

You will be seated in a comfortable chair during the infusion. Many patients read, scroll through their phones, or rest. A clinical team member will monitor you throughout.

Some patients notice a mild metallic taste, a sensation of warmth, or slight flushing during the infusion. These are common and generally pass quickly.

After the Infusion

You will be monitored for about 30 minutes after the infusion is complete. This observation period is standard practice to watch for any delayed reactions.

Most patients leave feeling fine and return to their normal activities the same day. Some experience mild fatigue, a headache, or muscle aches over the following 24 to 48 hours. These effects are typically short-lived.

Side Effects and Safety

Honesty about side effects matters, so here is what the evidence shows.

Common side effects(experienced by a notable percentage of patients) include:

• Headache
• Nausea
• Muscle or joint aches
• Mild flushing or warmth at the infusion site
• Temporary metallic taste
• Darkening at the injection site

These effects are generally mild and resolve within a day or two.

Less common but worth knowing about:

• Dizziness or lightheadedness during or shortly after infusion
• Low blood pressure during the infusion (your care team monitors for this)
• Fishbone/flushing reaction: temporary chest tightness and flushing that can occur with certain IV iron formulations. This is not an allergic reaction and typically resolves when the infusion rate is slowed.

Rare but serious:

• Severe allergic reaction (anaphylaxis). This is why patients are monitored during and after the infusion. While rare, infusion clinics are equipped to manage it.
• Hypophosphatemia (low phosphate levels) has been reported with certain IV iron formulations, particularly with repeated doses. Your hematologist may monitor phosphate levels if multiple infusions are planned.

The overall safety profile of modern IV iron formulations is well established. Many patients find that the side effects of IV iron are milder than what they experienced with oral supplements.

How Long Results Last

One of the most common questions patients ask is, “How soon will I feel better?”

Lab values often improve first. Ferritin levels may begin to rise within days of the infusion, and hemoglobin (if it was low) typically improves over two to four weeks.

Symptom improvement varies. Many patients report feeling more energetic within one to three weeks. Other changes, like hair regrowth or better exercise tolerance, may take longer to become noticeable.

How long the results last depends on what caused the deficiency. If the cause has been identified and addressed (for example, a medication change or treatment for heavy menstrual bleeding), a single course of iron infusions may be sufficient for months or longer. If the cause is ongoing, repeat infusions may be needed periodically.

Your hematologist will typically recheck your ferritin and hemoglobin about 8 to 12 weeks after the infusion to assess your response and decide whether additional treatment is needed. This follow-up is part of the process, not an afterthought.

Why a Hematologist, Not Just a Blood Test

A primary care physician can order blood work and prescribe iron supplements. That is a reasonable starting point. But when iron deficiency is persistent, recurrent, or not responding to standard treatment, a hematologist brings a different level of evaluation.

A hematologist specializes in blood disorders. That means looking beyond the numbers to ask: why is this person iron deficient? Is there an absorption issue? An unidentified source of blood loss? A bone marrow production problem? Something affecting iron metabolism?

That kind of root-cause investigation is what separates a specialist evaluation from a routine blood panel.

Dr. Max Brodsky is an ABIM board-certified hematologist who completed his fellowship at Johns Hopkins Hospital. His practice, Brodsky Hematology, focuses specifically on benign (non-cancerous) blood disorders, including iron deficiency, clotting disorders, and low platelet counts. This is not a general oncology practice that also handles blood disorders. It is a practice built around the conditions most commonly seen in outpatient hematology.

The Brodsky family’s connection to hematology spans three generations. Dr. Max Brodsky’s grandfather, Dr. Isadore Brodsky, was a pioneer in bone marrow transplantation. His father, Dr. Robert Brodsky, serves as the director of the Division of Hematology at Johns Hopkins and was the 2023 president of the American Society of Hematology. That lineage does not treat patients at this practice, but it reflects a family whose professional identity is rooted in blood medicine.

Next Steps if You Think Your Iron Is Low

If what you have read here sounds like your experience, a conversation with a hematologist is a reasonable next step.

Here is how the process works at Brodsky Hematology:

Getting a referral. You can be referred by your primary care physician or OB/GYN , or you can contact the office directly to schedule. Self-referrals are accepted.

What to bring to your first visit. Recent lab work (CBC, ferritin, iron panel if available), a list of current medications and supplements, and a brief timeline of your symptoms. The more context you bring, the more productive the visit will be.

Two locations. Brodsky Hematology’s primary office is at 2827 Smith Ave in Pikesville, MD. The Nottingham Iron Infusion Clinic is at 9920 Franklin Square Dr, Suite 220, in Nottingham, MD.

Scheduling. Call 410.653.4002 to schedule a new patient consultation. Telemedicine follow-ups are available for established patients in Maryland.

You do not need a diagnosis before reaching out. If your symptoms have persisted and standard approaches have not resolved them, a hematologist can help determine whether iron deficiency is part of the picture and what the right treatment path looks like for your situation.

Frequently Asked Questions

How long does an iron infusion take?

The infusion itself typically takes 15 to 60 minutes, depending on the formulation and dose. Plan for the full appointment to last about one to two hours, including setup, the infusion, and the post-infusion monitoring period.

Can you drive home after an iron infusion?

Most patients are able to drive themselves home. If you experience dizziness or lightheadedness during the monitoring period, have someone available to drive you. Your care team will advise you before you leave.

How many iron infusions will I need?

This varies based on the severity of your deficiency and the formulation used. Some patients need only one infusion, while others need two or three sessions spaced over several weeks. Your hematologist will determine the right number based on your lab results and response.

Do iron infusions cause weight gain?

Iron infusions are not associated with significant weight changes. Some patients notice mild water retention or bloating in the days following an infusion, but this is typically temporary.

Does insurance cover iron infusions?

Most insurance plans cover iron infusions when they are deemed medically necessary. Coverage details vary by plan, so contact your insurance provider or the practice directly at 410.653.4002 to verify your benefits before scheduling.

What ferritin level means I might need an iron infusion?

There is no single cutoff that applies to every patient. Generally, a ferritin below 30 ng/mL with symptoms may warrant further evaluation, though some patients experience symptoms at higher levels. Your hematologist will consider your ferritin alongside other lab markers and your clinical picture.

Can iron infusions help with hair loss?

If your hair loss is related to iron deficiency, replenishing iron stores may support hair regrowth over time. Many patients report improvement in hair thickness and reduced shedding several months after treatment. Hair loss has many possible causes, though, so your doctor should evaluate other factors as well.

Do I need a referral to see a hematologist for iron deficiency?

Not always. Brodsky Hematology accepts self-referrals, so you can contact the office directly to schedule a new patient consultation. Some insurance plans may require a referral for specialist visits, so check with your provider if you are unsure.