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Iron deficiency diagnosed
How is iron
deficiency diagnosed?
Iron deficiency diagnosed
Getting diagnosed
Iron deficiency diagnosed
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Getting answers starts with the right tests. If you’re experiencing symptoms of iron deficiency, book an appointment with your doctor. They can arrange simple blood tests to find out if low iron is the cause and help you get the right support. It’s your body, know what’s going on.

What tests will I need ?

A blood test can confirm if you are iron deficient. If low iron is contributing to your symptoms, your results will help you and your doctor decide what comes next. Your doctor will look at several important markers to get a clear picture of your iron levels.1–3 

Stylised molecule representing a ferritin test for iron stores

Measures your body’s iron stores. A low ferritin level is often the earliest sign of iron deficiency, even if other results appear normal.

Test tube with a blood drop representing a haemoglobin test

Iron is needed to make Hb, which helps carry oxygen around the body. Without enough iron, your Hb levels can drop, causing iron deficiency anaemia.

Three blood test tubes icon representing additional iron tests such as transferrin saturation

Your GP might also check other markers, such as transferrin saturation (TSAT), to get a clearer picture of how much iron is available for your body to use, and how much is being carried in your blood.

Although serum iron is often checked, it does not always give an accurate picture of your overall iron status.

Can I be low in iron even if my haemoglobin is normal?

Yes, many women experience symptoms of iron deficiency even before they develop anaemia.4  That’s why it’s important for your doctor to check your ferritin as well as your haemoglobin, especially if you have symptoms or are at risk. If you’re worried this might apply to you, ask your doctor to test both.

What should I ask my doctor?

If you think iron deficiency could be affecting you, ask your doctor about having your iron checked. You can bring a list of your symptoms and discuss the different tests available. 

We’ve put together some useful tips and questions to help you feel more confident when discussing iron deficiency with your doctor. Be brave. Be vocal. Feel yourself again.

Woman in shorts and sleeveless top striking a strong pose, with her hand raised to her head

If your blood tests confirm iron deficiency, don’t panic. There are effective treatments available to help you feel better. Knowing your options can help find an approach that works for you, so you can get back to feeling your best.

References
References

References:

  1. Iolascon A et al. Recommendations for diagnosis, treatment, and prevention of iron deficiency and iron deficiency anemia. Hemasphere 2024;8(7):e108.
  2. National Institute for Health and Care Excellence. What investigations should I arrange to confirm iron deficiency anaemia? 2024. Available at: https://cks.nice.org.uk/topics/anaemia-iron-deficiency/diagnosis/investigations/ (Accessed August 2025).
  3. Medical News Today. Which tests can diagnose iron deficiency anemia? 2021. Available at: https://www.medicalnewstoday.com/articles/iron-deficiency-anemia-test (Accessed August 2025).
  4. Dugan C et al. The misogyny of iron deficiency. Anaesthesia 2021;76(Suppl 4):56–62.