What is the Iron test?

The Iron blood test measures the level of iron circulating in the bloodstream. Iron is an essential mineral required for the production of haemoglobin, the protein in red blood cells that carries oxygen throughout the body.

Iron levels fluctuate throughout the day and are influenced by diet, absorption, storage and blood loss. For this reason, iron is often interpreted alongside other markers such as ferritin, transferrin and total iron-binding capacity (TIBC).

This test is commonly used in the investigation of anaemia, fatigue, weakness, and disorders of iron metabolism.

Why do I need an Iron test?

Abnormal iron levels can significantly affect energy, cognition and overall health. Testing helps identify whether symptoms are due to iron deficiency, excess, or impaired iron handling.

You may need an Iron test if you:

• Feel tired or weak
• Have suspected anaemia
• Experience shortness of breath
• Have pale skin
• Have heavy menstrual bleeding
• Are pregnant or postpartum
• Have gastrointestinal symptoms or blood loss
• Are being monitored for iron overload

Symptoms associated with iron imbalance include:

• Fatigue
• Dizziness
• Headaches
• Shortness of breath
• Hair thinning
• Brittle nails
• Reduced exercise tolerance

Benefits of the Iron test

• Identifies iron deficiency
  A common cause of fatigue and anaemia.
• Supports anaemia diagnosis
  Helps determine underlying cause.
• Detects iron overload
  Useful in conditions like haemochromatosis.
• Guides supplementation decisions
  Prevents unnecessary or harmful iron use.
• Supports pregnancy monitoring
  Iron needs increase during pregnancy.
• Complements ferritin testing
  Provides a fuller iron profile.
• Clinically established test
  Used routinely in primary and specialist care.
• Simple blood test
  Requires only one sample.

Step by step – how the test works

You can access Iron testing UK-wide through two options:

1. Clinic appointment
   Attend your nearest UK clinic, where a healthcare professional will take your blood sample.
2. At-home or hotel visit (£60 extra)
   A qualified phlebotomist comes to your home or hotel, so you don’t need to travel.

Your sample is analysed in an accredited UK laboratory and results are delivered securely.

Your results explained

Low iron levels

Suggest iron deficiency, often due to blood loss, poor intake or absorption problems.

Typical UK interpretation:

• Men: < 11 µmol/L
• Women: < 8 µmol/L

Normal iron levels

Indicate adequate circulating iron.

Typical UK interpretation:

• Men: 11–30 µmol/L
• Women: 8–30 µmol/L

High iron levels

May indicate iron overload, excessive supplementation or metabolic disorders.

Typical UK interpretation:

• > 30 µmol/L

Iron should be interpreted with ferritin and transferrin for accuracy.