Low Ferritin Treatment in Cardiff — What Your GP Might Be Missing
Your GP said your bloods are "fine." But you're exhausted, your hair is falling out, and you can't think straight. If your ferritin is technically "normal" but you feel anything but — you're not imagining it, and you're not alone. IronOx Clinic in Cardiff treats low ferritin directly, with no GP referral needed.
The Mews, 38 Cathedral Road, Cardiff CF11 9LL · Serving Cardiff and all of South Wales
What is ferritin — and what does "low" actually mean?
Ferritin is the protein your body uses to store iron. Think of it as your iron savings account. When your ferritin is low, your iron reserves are depleted — even if your haemoglobin (the iron in circulation) still looks "normal" on paper. Your body is running on empty, drawing down the last of its reserves to keep basic functions going.
Here's the problem: most NHS laboratories set the lower limit of their ferritin reference range somewhere between 13 and 15 µg/L. If your result is 16, it comes back as "normal." But a ferritin of 16 is not optimal — and growing evidence suggests that symptoms of iron deficiency can begin at ferritin levels below 30 µg/L. Many haematologists and endocrinologists consider optimal ferritin to be above 50 µg/L.
This gap between "lab normal" and "clinically well" is why so many patients — particularly women — are told their blood tests are fine while they feel genuinely unwell. It's not a criticism of your GP. It's a limitation of how reference ranges are set and how 10-minute appointments work. The system wasn't designed to catch this.
Symptoms of low ferritin
Low ferritin doesn't always show up as anaemia on a blood test. But it can still make you feel terrible. These symptoms are real, they are documented, and they are treatable.
Why "normal" ferritin can still leave you unwell
Iron depletion happens in stages. First your ferritin drops — your stores are emptying. Then your transferrin saturation falls — your body is struggling to transport enough iron. Finally, your haemoglobin drops and you're diagnosed with anaemia. But by that point, you've likely been symptomatic for months.
The standard GP blood test catches the last stage. It's not designed to detect the early, symptomatic stages of iron depletion. And because ferritin reference ranges are set so wide, a patient with a ferritin of 18 gets the same "normal" stamp as someone with a ferritin of 180.
Oral iron supplements are the usual recommendation, but they come with their own challenges. Gut side effects are common — nausea, constipation, cramping — and absorption is often poor, especially if there's an underlying gut condition or inflammation. Many patients take tablets for months without meaningful improvement in their ferritin.
When oral iron hasn't worked, or can't be tolerated, IV iron offers a direct route to replenishing your stores — without relying on gut absorption.
Ferritin levels — what the numbers mean
- Below 15 µg/L
- Deficient — Usually flagged by GP
- 15–30 µg/L
- Low — Often missed — symptoms common
- 30–50 µg/L
- Suboptimal — Some patients still symptomatic
- Above 50 µg/L
- Optimal — Target for most patients
Ranges are approximate and vary by lab. Always interpret alongside symptoms and clinical context.
Treatment options for low ferritin
Dietary changes
Iron-rich foods — red meat, liver, lentils, spinach, fortified cereals — can help prevent further depletion. Pairing with vitamin C improves absorption. But if your ferritin is already low, diet alone is unlikely to restore your stores fast enough to resolve symptoms.
Best for: prevention and long-term maintenance
Oral iron supplements
Ferrous sulphate or ferrous fumarate, typically taken on an empty stomach. Works for some, but side effects are common and absorption is limited — particularly with gut inflammation, coeliac disease, or concurrent use of PPIs. Can take 3–6 months to meaningfully raise ferritin.
Best for: mild depletion with good gut absorption
IV iron infusion
A single 30-minute infusion delivers up to 1000mg of iron directly into your bloodstream. No gut involvement, no side effects from tablets, no months of waiting. Ferritin typically rises significantly within 2–4 weeks. NICE-recommended when oral iron has failed or isn't tolerated.
Best for: persistent low ferritin, oral iron intolerance, malabsorption
Treatment depends on your individual ferritin level, symptoms, and medical history. Dr Ros will assess the full picture and recommend the most appropriate option for you.
How IronOx Clinic treats low ferritin in Cardiff
We look at the full picture
Dr Ros doesn't just glance at your ferritin number. She reviews your full iron panel — ferritin, serum iron, transferrin saturation, TIBC — alongside inflammatory markers that can falsely elevate ferritin. If your ferritin is "normal" but your symptoms say otherwise, she'll investigate why.
Your symptoms matter
A ferritin of 20 with no symptoms is different from a ferritin of 20 with crushing fatigue and hair loss. We take your experience seriously and use it as clinical evidence alongside your blood results — not as something to dismiss.
No referral, no wait
You don't need your GP to agree that something is wrong before you can see a specialist. Book directly at our Cardiff clinic on Cathedral Road — no referral letter, no gatekeeping. Most patients across Cardiff and South Wales are seen within the same week.
Treatment and investigation
If your ferritin is persistently low, there's a reason. Dr Ros will not only treat the deficiency but help identify what's driving it — whether that's heavy periods, a gut condition, or something else that needs addressing.
Real patient experience
"Can't praise Dr Ros enough. Staff are very friendly, the treatment room was extremely clean."
Low ferritin — common questions
Most NHS labs flag ferritin as "low" only below 15 µg/L. But research consistently shows that symptoms of iron deficiency — fatigue, brain fog, hair loss, restless legs — can occur at levels well below 30 µg/L, and many specialists consider optimal ferritin to be above 50 µg/L. At IronOx Clinic, Dr Ros assesses your ferritin alongside your symptoms, not just against a lab reference range.
Yes. "Normal" on a lab report means your result falls within the reference range — which can start as low as 13 µg/L. That range reflects the statistical distribution of the population, not the level at which you feel well. A ferritin of 15 is technically "normal" but can absolutely cause symptoms. This is one of the most common reasons patients come to us.
Yes. Ferritin is essential for healthy hair growth, and studies have linked ferritin levels below 30–40 µg/L to increased hair shedding (telogen effluvium). Many patients notice their hair loss improves after their iron stores are properly restored — though it can take several months for regrowth to become visible.
If oral iron hasn't raised your ferritin — whether due to side effects, poor absorption, or ongoing losses — IV iron infusion is the next step. A single infusion delivers up to 1000mg of iron directly into your bloodstream, bypassing the gut entirely. It's NICE-recommended and used routinely across the UK.
Ferritin levels typically rise significantly within 2–4 weeks of an infusion. Many patients report symptom improvement within 1–2 weeks. A follow-up blood test at 4–6 weeks confirms whether your stores have been adequately replenished.
Your ferritin deserves a second opinion
If you've been told your iron is "fine" but you still feel awful, a specialist assessment could change everything. No referral needed — appointments available this week.