Told your bloods are "normal" but still exhausted, losing hair, or struggling to concentrate? The test you actually need might not have been run. Here's what ferritin is, how it differs from iron, and why so many people are sent away with no answers.
What is ferritin?
Ferritin is the protein that stores iron in your body. Rather than measuring how much iron is circulating right now, a ferritin test tells you how much iron you have in reserve — your body's iron "savings account." It's considered the single most important marker for detecting iron deficiency, often flagging a problem well before other markers change.
What's the difference between ferritin and iron?
Serum iron measures the iron currently circulating in your blood at that moment, which naturally fluctuates throughout the day. Ferritin measures your stored reserves, which is a far more stable and reliable indicator of your overall iron status. You can have "normal" circulating iron while your stored ferritin is critically low — which is exactly how so many low-ferritin cases get missed.
Can you have low ferritin with a "normal" blood test?
Yes — and it's more common than most people realise. Standard blood tests often check haemoglobin alone, which can stay within a normal range even when ferritin has dropped significantly. That means it's entirely possible to be told your bloods are fine while still running on genuinely depleted iron stores.
What are the symptoms of low ferritin?
- Persistent fatigue and low energy
- Hair shedding, thinning, or slow regrowth
- Difficulty concentrating or brain fog
- Breathlessness during normal activity
- Feeling exhausted despite a "normal" blood test result
What counts as a good ferritin level?
This is the detail most people are never told: the ferritin level needed to avoid a diagnosis of anaemia is considerably lower than the level associated with feeling genuinely energised and supporting healthy hair growth. Being "not anaemic" and being optimal are two different things — which is why some people are cleared by a standard test but still feel unwell.
Who should get an iron studies test?
- Anyone with ongoing fatigue or low energy without a clear explanation
- Anyone noticing increased hair shedding or thinning
- Anyone told their bloods are "normal" but who still feels unwell
- Pregnant women, or those who are breastfeeding or recently gave birth
- Vegetarians and vegans monitoring iron absorption
- Anyone with heavy periods or a history of iron deficiency
- Anyone with a family history of haemochromatosis (iron overload)
- Anyone currently taking iron supplements who wants to track progress accurately
- Regular blood donors and endurance athletes
What does a full iron studies test include?
A complete iron studies panel measures four markers together: ferritin (stored iron), serum iron (circulating iron), transferrin (the protein that transports iron), and transferrin saturation (the percentage of transferrin actively carrying iron). Together, these give a genuinely complete picture — something a basic haemoglobin check alone cannot provide.
Where to get tested
Our Iron Studies Blood Test covers all four key markers in one panel, so you get real answers instead of being told everything's "normal" and sent away.
Stop guessing why you're exhausted. Book your Iron Studies test, or book a free consultation if you'd like to talk it through first.
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