Is My Ferritin Low? What to Check Beside the Number
Ferritin 32 is neither low nor fine on its own. It depends on three things beside it: is there inflammation in your blood, is your iron saturation low, and is the number falling from earlier results. A normal result does not mean you were checked. It means the thing they checked landed inside that lab's range. Start with the five items below, then count your hair tonight.
Ask for these five things from your printout
Say this at your next appointment: "My ferritin was 32. Can we look at it alongside my iron saturation, a CRP and my haemoglobin, and can I see my earlier results?"
Then get these five things and write each one down:
- The lab's lower limit. The small range printed next to your 32. Labs draw that line in different places, so "normal" means something different on every printout.
- The date of the test. A number without a date cannot be compared with anything.
- Transferrin saturation. The share of your iron carriers that are loaded right now. Ferritin is the stock in the cupboard; saturation is what is on the road.
- CRP. A marker of inflammation in the blood. It shows whether something other than iron stores is pushing your ferritin up.
- Haemoglobin, and your previous ferritin. Haemoglobin is the oxygen carrier in red cells, and it drops last. Ask for any older ferritin on file, even from years ago.
If you have taken iron tablets recently, say so. They lift ferritin for a while and make the picture look better than it is.
Count your hair at five sites tonight
A sheet of white paper and a pen (8 min) · 8 min
- Choose an evening when your hair is dry, not washed that day and not just brushed.
- Take a small section near the roots between your fingers and slide slowly to the tips without tugging.
- Lay the hairs that came away on the white paper and count them.
- Repeat at five sites: left temple, right temple, crown, back of the head, front hairline.
- Write the five counts, their total and today's date.
- Separately, on your heaviest period day, write the hours between changes of protection.
What you end up withhairs per site at five sites, plus the total and the date
- Nothing, or a few hairs, and no site repeatsclearTonight there is nothing to show on this measure. It does not mean your iron is fine.If you are still tired or your ferritin sits close to the floor, ask for the five items anyway.
- Hairs at one or two sitesmildSome shedding in places. This count alone cannot say why.Save the total and date, repeat in the same conditions in a few weeks, and bring both.
- Hairs at three or four sitesmoderateShedding across much of the head, which is a reason to ask what has been checked.Take the count with your five-item list and your earlier ferritin if you have one.
- Hairs at all five sitesmarkedShedding everywhere. Many causes are possible; iron is one question among several.Ask for a fuller look, including saturation, CRP and thyroid tests, and bring the count.
When this test liesRight after a wash or right after brushing, which give too few or too many. After heavy stress or illness in recent months, after childbirth, after a change of medicine, or with dense backcombing. The point in your cycle and the season can shift shedding. The test says nothing about ferritin by itself.
Find your case
| Your number | What it means | What to ask for | First step |
|---|---|---|---|
| Saturation low, CRP normal | Little iron is on the road and nothing points to inflammation flattering the ferritin. This pattern is associated with low iron supply. | Whether iron deficiency without anaemia fits, and what would confirm it | Bring all five items and ask what the next test or visit would be |
| CRP raised | Inflammation can push ferritin up, so 32 may look better than your real stores. The number is harder to read, not safer. | Whether the ferritin can be trusted today, and whether to repeat it once the inflammation has settled | Ask what is causing the raised CRP and write down the answer |
| Haemoglobin normal, everything else normal, symptoms still there | Haemoglobin falls last, so a normal one does not close the iron question. It may also mean the cause sits elsewhere. | What else has been ruled out, and whether a repeat in a few months makes sense | Ask for the repeat to be booked now, not left to you to remember |
| Ferritin lower than your last result | A falling line is a lead to investigate. One point cannot show a direction; two or three can. | Where iron could be leaving or not getting in, and whether to look into it | Bring the older results, dated, and put them side by side |
| Periods heavy | Monthly blood loss is a common route for iron to leave. It is worth measuring rather than describing. | For heavy periods to be assessed alongside the iron panel | Record hours between changes on your heaviest day and bring it |
Why 32 can look fine when your stores are lower
Your blood count measures the iron in work right now, inside red cells. Ferritin measures what is in the cupboard. The body protects the first by spending the second, so the count can hold steady while the cupboard empties.
Ferritin is also a protein that rises when the body is inflamed, whatever your iron stores are doing. With an infection, a flare of an autoimmune condition or other inflammation, your 32 can be higher than your real stores. How much higher, I can't say: I have no source with a number. What you can do is ask for CRP, the inflammation marker, drawn at the same time.
Saturation tells you how much iron is travelling at the moment. A low saturation next to a middling ferritin tells a different story from a normal saturation next to the same ferritin. Read about it in What Transferrin Saturation and TIBC Mean on Your Iron Panel, and about the opposite puzzle in Ferritin Normal but Iron Low? Check Saturation and CRP.
Anaemia is the last stage of running out of iron, not the first. Everything before it has no name on the printout, so nothing gets done about it. Lab ranges are built from the people a lab measured, so "in range" describes the crowd. It does not say whether the number is enough for you, and a short appointment has no room to ask. The reading of your 32 is in the neighbouring numbers.
Run the hair test tonight and bring a count, not the word "a lot"
The full steps are in the test box above. Here is what to do with the result.
The total and the date are what matter. Repeat in the same conditions in a few weeks and bring both counts. The test counts shedding and says nothing about ferritin by itself.
When the test lies. It gives too few or too many after a wash or right after brushing. A big stress or illness in recent months can make hair shed on its own schedule, so can childbirth or a change of medicine. Dense backcombing hides the hairs. The point in your cycle and the season can shift shedding, so repeat at the same point in your cycle and, if you can, at a similar time of year.
Your period record, separately. On your heaviest day, write how many hours pass between changes of protection, and how many changes you make in twenty-four hours. "Heavy" gets nodded at. "A pad every hour for six hours" gets written down.
Check which way the line is going and where iron leaves
One result is a snapshot. A result from last year next to this year's is a line, and its direction often matters more than where it sits against the lab's floor.
A falling line is a lead to investigate. It sends the question to where iron might be leaving or not getting in. Iron leaves through heavy periods, blood donation and a diet low in iron. It can also fail to get in: gut conditions can reduce absorption, and that is a question for your doctor.
So an older result is worth more than another new test today. If you cannot find one, ask the surgery or lab whether anything is on file under your name, and ask for it with the date.
The symptom list in Low Ferritin Symptoms Checklist to Bring to Your Appointment helps you write down tiredness, hair and cold hands with dates. And Iron Deficiency Without Anaemia: Why Tired Is Not In Your Head explains why a normal blood count does not settle the question.
Iron taken before the test raises ferritin and hides the picture. If you are thinking about supplements, say so at the appointment and decide together after the recheck, not before.
What else to look at if iron turns out not to be the cause
Sometimes the iron panel comes back clear and you are still tired, with hair on the pillow. Then the cause sits elsewhere, and the useful question is what has been ruled out.
The thyroid is the usual next stop. It is the gland in your neck that sets the pace of the body, and when it slows down the symptoms look much like low iron. Ask which thyroid tests were done and whether antibodies, the immune markers that point at a thyroid under attack, were included. The site covers one side of this in How Long Does a Hashimoto's Flare-Up Last? Nobody Has Timed It.
Write the answers down, whatever they are. A negative result is also information, and it changes the next question.
What to say if you are told it is fine again
Your doctor may well say your result is normal, and by the lab's range that is true. Appointments are short, ranges are printed on the page, and the quickest reading is the one in front of you. The fault sits in the system, not in the person reading the page.
Don't argue with "normal". Ask what it was compared against. Say: "I understand it is within the lab's range. Can we look at saturation and CRP, and can we repeat the ferritin in a few months to see the direction?"
If the answer is still no, ask for it to be written in your notes that you asked, and why it was declined. That is a reasonable request and it costs nothing.
Then go home, take the printout, and write the lab's lower limit beside your 32 in pen. Under it, leave a blank line with a date to fill in at the next test.
If it does not go to plan
- Your lab printout shows no lower limit next to the 32Ask the lab or the surgery for the reference range used for that test. Without it you cannot tell what "normal" was measured against.
- Nobody can find an earlier ferritin resultAsk whether other iron or blood count results are on file, and if not, ask for a repeat to be booked so a second point exists.
- The CRP comes back raisedAsk what is causing it and whether the ferritin should be repeated afterwards. Do not read the 32 as reassuring until you know.
- You started iron tablets before the testTell the doctor the date you started. The ferritin may be flattered, and the doctor can judge the timing of a recheck.
Honestly: what is settled and what is not
I have no source here that gives a line between low and fine for ferritin or saturation, so I have named none. I also have nothing that says how much inflammation raises ferritin. The hair count is a way to bring a measurement, not a test of iron. What a single 32 means for you is decided by the panel around it and your doctor.
What to do with this
- Ask for saturation, CRP and haemoglobin alongside your ferritin, and write each down.
- Copy the lab's lower limit and the date next to your 32.
- Request your earlier ferritin results and compare the direction.
- Count your hair at five sites and record the heaviest-period hours between changes.
- Tell your doctor about any iron you have taken before deciding anything about supplements.
Questions people also ask
Is ferritin 32 low?
It depends on the lab's lower limit printed next to it, your saturation, your CRP and whether it is falling from earlier results. On its own it is one reading and cannot be called low or fine. Ask for the neighbouring numbers and an older result before drawing a conclusion.
Can I be tired with a normal haemoglobin?
Yes. Haemoglobin tends to fall last, after the stores have been running down for a while. A normal one does not rule out an iron question, and it does not rule out other causes either. Ask what else has been checked.
Should I take iron before the recheck?
Tell your doctor first and decide together. Iron raises ferritin for a while and can hide the real picture, so taking it before a repeat test can make the recheck harder to read. I cannot advise a dose or product.
Does the hair test tell me if I am iron deficient?
No. It counts shedding at five sites and gives you a number and a date to bring. Many things cause shedding, so only blood tests and your doctor can say whether iron is involved.
This article is information, not medical advice, diagnosis or treatment. Reference ranges, doses and protocols differ between people and between laboratories. Talk to a qualified clinician before changing anything about your care.