Why Your Iron Can Be Low When Your Blood Test Says Normal

You have been tired for months, maybe years. Your doctor ran some bloods, told you they were normal, and you walked out still exhausted and feeling a bit silly for having asked.

I see this in clinic all the time, and there is usually a reason for it.

Your body has a delivery system, and a warehouse

Let me show you how iron actually works, because once you can picture it, everything else makes sense.

Iron comes in through your gut, the loading dock. Standing on that dock is a hormone called hepcidin, the gatekeeper, and it decides how much iron is allowed through the door. Remember that name, because it explains an enormous amount later on.

Once iron is through, it gets loaded onto transferrin, a protein that acts like a fleet of delivery vans, carrying iron around your bloodstream to wherever it is needed. When your doctor measures transferrin saturation, all that means is: how full are the vans? If they are running mostly empty, iron is not getting where it needs to go, whatever else your results say.

Some of that iron goes straight to work. The rest goes into storage, measured by ferritin, your warehouse. And finally there is the destination. Haemoglobin is the protein inside your red blood cells that iron becomes part of, so it can carry oxygen to your muscles and your brain. It is the one most people have heard of, because it appears on every blood count.

Here is the bit almost nobody explains.

Your body will empty the warehouse completely before it lets the deliveries fail. It protects haemoglobin fiercely, because oxygen matters more than reserves. So you can be walking around with almost nothing left in storage while your blood count still looks perfectly fine.

Which means "your bloods were normal" and "your iron is fine" are not the same sentence at all.

How to actually read your iron results

Iron studies overwhelm people, and I include doctors in that. So here is what each number is really telling you, in plain terms.

Ferritin moves first, which is why it is the test you want, but on its own it tells you only what is in the warehouse. A full set of iron studies answers the rest off the same needle, and transferrin saturation is the sanity check when ferritin and your symptoms do not match.

CRP is the context. It tells us there is inflammation somewhere, though not where. That matters because inflammation pushes ferritin up, so without a CRP you cannot always tell whether a reassuring ferritin is reassuring. I ask for a high sensitivity one, because it picks up the grumbling, low-grade sort that a standard test rounds down to nothing, and that is exactly the kind that inflates a ferritin.

What low iron actually feels like

Fatigue is the big one, and there is a lot of evidence behind it. Not the ordinary tiredness of a busy life, but the sort where you sleep and wake up feeling like you have not. That is the symptom that most reliably improves when iron is put back. Alongside it, women commonly notice trouble with concentration, memory and mood, that foggy feeling where words go missing mid-sentence.

Restless legs deserves its own mention, because so few women realise it is connected. That crawling, fidgety feeling in your legs in the evening, or the urge to move them just as you are trying to fall asleep. I see this constantly in perimenopause and it is very often iron related. For restless legs we aim for a considerably higher ferritin than we would otherwise, so a level that might be shrugged at in another woman is often not enough here.

Hair loss comes up in almost every consultation. It is possible that low iron contributes, and if you are losing hair it is sensible to have your iron checked as part of looking into it. It is rarely the whole story, but it is easy to rule in or out.

And when iron gets low enough that haemoglobin starts to fall, the picture changes. This is where women get palpitations, breathlessness on stairs, dizziness and noticeable pallor. Those symptoms tend to mean things have been going on for a while.

The number on your report, and why it may have been filed

This is the part I most want you to take away. A standard blood count does not measure your iron stores. If nobody ordered a ferritin, nobody looked in the warehouse, and that is far and away the commonest way this gets missed.

But there is a second thing, and it hides in the reference range printed next to your result.

Most laboratory ranges here start at around 20. So a ferritin of 22 lands inside the range, gets reported as normal, and gets filed. Nobody rings you. On paper, nothing happened.

The trouble is what those ranges are built from. A laboratory reference range describes how a large group of supposedly normal people tested. It captures where most of them sat, which is not the same thing as the point at which you personally start to struggle. And when it comes to iron, that group of supposedly normal women was itself substantially iron deficient. So we took a population where a lot of women were short of iron, worked out the range they fell into, and called that normal. The bar was set by the very thing we are trying to detect.

It shows up in the research. Studies looking directly at bone marrow, the definitive way to see whether iron stores are truly empty, have found that somewhere between 30 and 50 percent of otherwise healthy women have no iron in the marrow at all, despite a ferritin the laboratory called normal.

Which is why the thinking has moved. Some studies now report a figure closer to 50 as the point where a woman's body actually starts to run short. At the older, lower thresholds, a large proportion of women who really are deficient get missed, and told they are fine.

That matches what I see. The women sitting in front of me with symptoms are very often well above the laboratory's lower limit, and once a woman is comfortably over 50 I find iron is usually no longer the thing driving how she feels. So that is what I aim for, rather than just over 20. It is my clinical judgement rather than a rule, but it is what I have found makes a difference.

So if your ferritin came back as 25, or 32, and you were told it was normal, that is technically true and practically not very useful. You are allowed to ask what the actual number was.

Can iron be too high?

Yes. Higher ferritin has been linked in large studies to insulin resistance and type 2 diabetes, more strongly in women than men, though it may be a marker rather than a cause. We are not chasing the highest number we can get. We are aiming for a comfortable middle.

One specific thing is worth flagging, because I pick it up more often than you might expect. Haemochromatosis is an inherited condition where the body absorbs far more iron than it needs and stores it where it should not, like the liver. It is more common than most people realise, particularly in families with northern European ancestry, although plenty of carriers never develop iron overload. One of its main symptoms is, unhelpfully, tiredness, so a woman can arrive convinced she is low in iron when the opposite is true. The pattern to look for is a raised ferritin together with a high transferrin saturation, and it is worth asking your doctor about the genetic test. I have diagnosed this in women who had no idea it was in their family, so do ask even if nobody has mentioned it.

When ferritin hides the truth

Here is the situation that catches out so many women. Ferritin is not purely an iron marker. It also rises with inflammation anywhere in the body: infection, autoimmune conditions, ongoing low-grade inflammation, carrying extra weight, all of it pushes ferritin up regardless of how much iron you have.

So a woman with an inflammatory condition can have a ferritin of 60, be told her iron is fine, and be short of iron all the same. The warehouse looks stocked on paper. It is not. This is why, when inflammation is in the picture, we work to a much higher threshold, often around 100 rather than 20 or 30, and why transferrin saturation matters so much here. Empty vans alongside a full-looking warehouse means something is wrong with the system rather than with the supply.

And this is where hepcidin comes back.

Hepcidin, the gatekeeper

I find this one of the most interesting bits of physiology in women's health, and it explains several things that otherwise make no sense.

Hepcidin is a hormone made by your liver, and its job is to control how much iron is moving around your body. When it senses inflammation, it produces more. More hepcidin does two things. It closes the door at the loading dock, so less iron gets absorbed from your food and from any tablets you take. And it holds iron inside your cells, so it is not released into the vans and taken where it is needed.

This is not hepcidin misbehaving. Bacteria need iron to multiply, so when your body detects an infection, hiding the iron away is a genuinely clever piece of defence. The difficulty is that hepcidin cannot tell the difference between a chest infection lasting a fortnight and the low-grade, ongoing inflammation so many of us carry now, from metabolic changes, from stress, from the way we live. A system designed for brief emergencies ends up switched on quietly in the background for years. That is a mismatch between old biology and modern life, rather than anything going wrong with you.

The result is a state doctors call functional iron deficiency, where you have iron but you cannot use it. It also explains why iron tablets sometimes seem to do nothing: if hepcidin has shut the door, very little is coming in. And hepcidin rises for about a day every time you take a tablet, which turns out to change how we should be taking them.

The four ways iron can be low

Which one applies to you changes everything about what should happen next, so it is worth working out.

One: you are losing more than you take in

For most women still having periods, this is menstrual blood loss, and it is the single biggest cause. Slow bleeding from the gut belongs here too, and it can be completely invisible. So does regular blood donation, and endurance training. The clue is that the losses keep coming, so your stores never get the chance to refill.

Two: not enough is coming in

Restrictive eating, a chaotic week of meals grabbed standing up, or times of higher demand like pregnancy and breastfeeding, which draw down your stores over years and often never get replaced. In the last New Zealand Adult Nutrition Survey, around one in six women aged 31 to 50 was not getting enough iron in her diet. Among teenage girls it was closer to one in three.

Three: it is coming in but you cannot absorb it

The loading dock is blocked, and this is the group most often missed. If you have taken iron faithfully for months and nothing has changed, look here.

Coeliac disease is the most important to exclude, because it damages exactly the part of the small bowel where iron is absorbed, and because treating it works. One practical point: the blood test only works if you are still eating gluten, so keep it in your diet until you have been tested.

Beyond coeliac, a range of gut issues can get in the way. Inflammatory bowel disease. A stomach bacterium called H. pylori. Previous gut surgery. Conditions that reduce stomach acid, since acid is what makes iron absorbable in the first place, which is also why long-term reflux medication can contribute.

One note on the reflux medication, because I do not want anyone stopping theirs after reading this. Raise it with your doctor rather than stopping it yourself.

Four: you have it but you cannot use it

This is the hepcidin problem described above, and tablets tend not to help because the door is shut.

And that is the whole point of splitting them up. A tablet sorts out number two nicely. It helps number one only while the bleeding continues, it does very little for number three, and for number four it is often the wrong tool altogether. Finding the cause comes before filling the warehouse.

Perimenopause, and why this lands so hard in your forties

If you are somewhere in the perimenopause transition, several things stack up at once.

Your periods often get heavier. This is one of the most common things women tell me, and it usually starts somewhere around the early forties. Cycles get unpredictable, bleeding gets heavier, and it goes on for years. That is a lot of iron leaving.

I want to say something about that, because so many women simply put up with it. Heavy bleeding is not something to endure because your hormones are changing. There are good options. A Mirena often transforms it. Tranexamic acid taken during your period can reduce the bleeding considerably. And it is worth finding out whether something structural is driving it, like fibroids, polyps or adenomyosis, all common at this age and all manageable once you know. If you are changing sanitary items more than once an hour, getting up at night to change, or passing clots bigger than a ten cent coin, that is worth investigating in its own right.

And oestrogen may have a say too. Inflammation creeps up as oestrogen drops, adding to the picture.

And the symptoms overlap almost perfectly. Fatigue, brain fog, low mood, feeling cold, breathless on the stairs. That is the iron list and it is also the perimenopause list. So iron problems get filed under hormones, hormonal problems get filed under iron, and the woman in front of us gets neither sorted properly. In practice it is very often both, and both need attention.

Did you know taking iron every day might not be the best way?

This surprises most people. Because hepcidin rises for roughly 24 hours after a dose, the tablet you take tomorrow morning runs straight into a door that your last tablet closed.

Space the doses out to every second day and you give hepcidin time to settle. Alternate day dosing absorbs a higher proportion of each dose and causes considerably fewer stomach upsets. When women have been followed for six months, those taking iron every second day ended up with the same iron stores as those taking it daily, on far fewer days of feeling unwell. So it is not a lesser option, and it is worth a chat with your doctor about the right dose and timing for you.

On side effects, they are very common. Nausea, constipation, that metallic taste, stomach cramps. Stopping because of them is understandable, and there is plenty we can do. Different preparations suit different people, and there are liquids as well as tablets. A lower dose is often a good answer rather than a compromise: above a certain point you do not absorb much more anyway, and the extra iron sitting unabsorbed in your gut is what causes the symptoms. Less really can work better.

On infusions. Iron given into a vein bypasses both the gut and the closed door, which makes it a good option when tablets have not worked, are not tolerated or are not being absorbed. We used to give iron by injection into the muscle and we do not do that any more, because absorption was unreliable and the side effects unpleasant. Infusions are a medical procedure rather than a top-up, and serious reactions are rare, but that is why you stay for observation.

In New Zealand, funded infusions have specific criteria, so it is a conversation to have with your GP. One part is worth knowing, because it makes the point this whole article has been making: funding is not limited to a ferritin under 20, and also covers a ferritin between 20 and 50 when your CRP is raised. The rules themselves accept that a ferritin in the twenties or thirties, alongside inflammation, is not the reassurance it appears to be. They do require anaemia, though, so if your blood count is still normal this door is not open yet.

On how long to keep going. Feeling better is not the finish line. Iron needs to continue for around three to six months after your levels have come right, because that is what refills the warehouse rather than just getting the deliveries moving. Stopping the day you feel human is the commonest reason women end up back where they started within a year.

Food, and getting iron from plants

Food matters, and food alone will not correct an established deficiency. Both things are true. Iron from plants is affected more by everything else on your plate than iron from meat is, which sounds like bad news and is actually the opposite, because it means the things you do at mealtimes really do move the needle.

Here is a figure I love, from our own national nutrition survey. It dates from 2008 and 2009 and New Zealand has not run another one since, which is a small scandal in itself. The single biggest contributor to New Zealand women's dietary iron is bread. Then breakfast cereals. Then vegetables, with beef and veal behind all three. One thing to hold alongside it: the survey counts what goes in, not what gets taken up, and iron from meat is absorbed more readily than iron from plants. Which is exactly why the next part matters as much as it does.

Vitamin C is your best lever, and this one is easy. Adding something with vitamin C to a meal substantially increases how much iron you absorb from it. So if you are having beans, lentils, tofu, wholegrains or seeds, put something bright next to them: capsicum, tomato, broccoli, a squeeze of lemon, or kiwifruit afterwards.

Tea and coffee are the biggest thing working against you. Tea with a meal can roughly halve the iron you absorb from it, and coffee does something similar. Here is the part that surprises people: it is not the caffeine doing this. It is the plant compounds in the leaf and the bean, the same ones we call tannins in tea, and they work by binding to iron in your gut so it passes straight through you. Which is why switching to decaf is unlikely to help. Timing matters far more than strength. In one study, coffee an hour before a meal made no difference at all, while coffee afterwards did. So you do not have to give up your tea or your coffee. Just move them away from your iron-rich meals, and have them between meals instead of with them.

On whole grains, legumes, nuts and seeds, they do contain compounds that reduce absorption, but that is not a reason to avoid them. They are excellent foods, the vitamin C trick counteracts much of it, and soaking, sprouting and fermenting all help. Calcium gets more blame than it deserves, and the longer-term evidence suggests the effect is small, so do not compromise your calcium through perimenopause when your bones need it.

One last thing I like: cooking in a cast iron pan. Small amounts of iron transfer into the food, particularly with anything acidic. Not a treatment, but a nice no-effort habit.

Why testing comes before tablets

This is the one genuinely important safety point in the whole article. Taking iron when you are not deficient does not help you, and it is not harmless. Stomach side effects are common, and for the small number of people who store iron the way haemochromatosis causes, tablets are actively harmful.

So get tested first. And if you are deficient, the next question is why, because that is the part that actually keeps you well.

When to see a doctor

Book in with your doctor if:

• You are persistently tired and have never had a ferritin done
• Your periods are heavy, or heavier than they used to be
• You have been told your iron is normal but you have an inflammatory condition
• You have taken iron properly for three months and nothing has changed
• Your iron deficiency came back after it was corrected

And go sooner if you have low iron together with any bleeding from the bowel, unexplained weight loss, a change in your bowel habit, or if your iron is low and there is no heavy bleeding to explain it. Past menopause, unexplained iron deficiency anaemia is taken more seriously and usually means looking at the gut properly.

If you are still having periods, it is reasonable to treat the bleeding, replace the iron and see how you go. The important part is the last bit. Somebody needs to check that it worked.

The bottom line

Your body will keep the oxygen moving long after the warehouse is empty. That is a clever piece of design, and it is exactly why you can be exhausted for a year with a blood count that looks completely fine.

Normal is not the same as optimal. The range on your lab report describes a population, not the point at which you personally start to struggle. Ask what your number actually was. And iron is a cause question before it is a tablet question. Refilling the warehouse without finding the leak just empties it again.

If you have been tired for a long time and nobody has looked properly, it is worth pushing for it. Iron does not explain everything. But it is common, it is measurable, and when it is the answer, it is fixable.

If you would like personalised support with iron, heavy bleeding or fatigue in perimenopause, I would love to help. You can book a consultation here.

Dr Taisia Cech

This article provides general educational information and is not personalised medical advice. Please consult your healthcare provider before making changes to your treatment, especially if you have medical conditions or are pregnant.

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