Iron Profile / Anaemia
Iron blood test in Plymouth
An iron blood test in Plymouth measures ferritin, serum iron, TIBC (total iron binding capacity), and transferrin saturation to assess your iron status. Iron is essential for carrying oxygen in your blood and supporting energy production — low iron is one of the most common but frequently missed causes of persistent fatigue. Our private iron blood test requires no referral and is perfect for anyone experiencing unexplained tiredness, especially if they’ve been told their full blood count is “normal.”
Why this test matters
The critical insight many people don’t know: you can have low iron storage (low ferritin) causing serious fatigue without having anaemia. Your haemoglobin can be perfectly normal on a full blood count, but if your iron stores are depleted, you’ll feel exhausted, brain-fogged, and unable to exercise. Many GPs only measure haemoglobin, missing the iron storage problem entirely. This comprehensive test checks not just whether you’re anaemic, but whether your iron stores are adequate and your iron transport system is working properly.
What this test measures
This test provides a complete picture of iron status by measuring how much iron is stored in your body, how much is circulating, and how effectively your body can transport it.
| Marker | What it measures | Why it matters |
|---|---|---|
| Ferritin | The protein that stores iron in your body — indicates how much iron is stored in organs and tissues | The most important test for iron deficiency fatigue. Low ferritin (even if “normal range” according to some labs) often causes fatigue, hair loss, and poor sleep quality. Optimal levels are typically 30–50 mcg/L or higher. Many people are exhausted with ferritin below 20 despite normal haemoglobin. |
| Serum iron | The amount of iron circulating in your bloodstream right now | Shows your immediate iron availability. Fluctuates throughout the day and week, so is less reliable than ferritin. Low serum iron combined with low ferritin confirms iron deficiency. High serum iron can indicate iron overload. |
| TIBC (total iron binding capacity) | How much iron your transferrin proteins can bind and transport | High TIBC indicates your body is struggling to bind iron — a sign of iron deficiency. Low TIBC can indicate iron overload or chronic disease. Interpret alongside serum iron and ferritin. |
| Transferrin saturation | The percentage of transferrin (iron transport protein) that is actually carrying iron | Shows how efficiently iron is being transported. Low levels indicate iron deficiency; high levels can indicate haemochromatosis (iron overload). Normal is typically 20–50%. |
Who should get this test?
If you have unexplained fatigue, this test is essential. It’s particularly important for women of childbearing age (heavy periods deplete iron), vegetarians and vegans (plant iron is less bioavailable), and anyone with ongoing tiredness despite adequate sleep.
- Persistent tiredness
- Breathlessness on exertion
- Hair loss or thinning
- Cold hands and feet
- Restless legs syndrome
- Heavy menstrual periods
- Vegetarian or vegan diet
- Poor sleep quality
- Difficulty concentrating
- Weak nails
What your results mean
Understanding your results
Your ferritin result is the key number. Traditional lab ranges say normal is 15–300 mcg/L, but many people feel fatigued and experience hair loss when ferritin is below 30 mcg/L. Our clinician interprets your results in context of your symptoms — someone with fatigue and ferritin of 22 mcg/L probably needs iron supplementation, even though it falls within the “normal range” some labs use. We also look at serum iron, TIBC, and transferrin saturation together to confirm iron deficiency and rule out other causes like haemochromatosis.
If your iron stores are low, we discuss supplementation options — oral supplements (ferrous sulphate, ferrous fumarate) are first-line, though some people tolerate alternatives better. We explain side effects (constipation is common) and how to maximise absorption (take on an empty stomach or with orange juice for vitamin C). If you have very low levels or can’t tolerate oral iron, IV iron infusion may be discussed. We’ll also investigate why your iron is low — heavy periods, poor diet, malabsorption, or bleeding are the usual causes.
What happens at your appointment
When you arrive at our Estover clinic in Plymouth, our clinician will discuss your symptoms in detail — duration of fatigue, impact on daily life, menstrual history if relevant, and dietary iron intake. We’ll ask about other symptoms like hair loss, cold extremities, and sleep quality. The blood draw is quick — usually from a vein in your arm — and takes less than five minutes. For best results, this should be done in the morning after not eating overnight.
Your results are typically ready within 24–72 hours. You’ll receive them either at a follow-up appointment where we discuss iron status, supplementation options, and expected timeline for improvement, or online if you prefer. If your iron is low, we explain the importance of supplementation, address any concerns about side effects, and discuss dietary changes that help iron absorption. We’ll arrange follow-up testing 6–8 weeks after starting supplementation to check that your levels are rising. Most people feel significantly better once ferritin is restored to healthy levels.
Frequently asked questions
Can I have low iron without anaemia?
Absolutely — this is the most missed diagnosis in general practice. Iron deficiency develops in stages: first your iron stores (ferritin) drop, then your serum iron drops, and finally your haemoglobin drops (anaemia). You can be in stage 1 or 2 with normal haemoglobin but severe fatigue. A full blood count alone misses this — you need ferritin testing.
Why do women need this test more than men?
Women lose blood (and iron) every month during menstruation. Depending on how heavy your periods are, you may lose significant iron monthly — far more than a man. Women aged 19–50 need 18 mg of iron daily compared to men’s 8 mg, partly to replace menstrual losses. This is why low iron is so common in women of childbearing age.
I’m vegetarian/vegan — am I guaranteed to have low iron?
Not guaranteed, but higher risk. Plant-based iron (non-haem iron) is absorbed less efficiently than meat-based iron (haem iron), and vegetarians need 1.8 times more iron daily to compensate. If you’re eating plenty of iron-rich plants (lentils, beans, fortified cereals, dark leafy greens) plus vitamin C sources (citrus, berries, tomatoes) for enhanced absorption, levels can be fine. Testing is the only way to know.
How long does iron supplementation take to work?
Many people notice improved energy within 2–3 weeks, though it takes 6–8 weeks for iron stores to fully replenish. It’s important to keep taking supplements even after you feel better — ferritin needs to recover to healthy levels to prevent relapse. Your clinician will order repeat testing at 6–8 weeks to confirm improvement.
Why might my GP have missed low iron?
Many GPs only order a full blood count (FBC) as a screening test, which checks haemoglobin but not ferritin. If your haemoglobin is normal, they assume your iron is fine and don’t investigate further. You need specific ferritin testing, which this test includes, to get the full picture of iron status.
Related tests
Book your iron blood test in Plymouth
No referral needed. Results within 24–72 hours. From £25 appointment fee.
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