Erythropoietin
This test measures erythropoietin, a hormone that regulates red blood cell production. It helps determine the cause of anaemia and abnormal haemoglobin levels.
Turnaround time
1 day
Biomarkers count
1
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Details about Erythropoietin
What is the Erythropoietin Test?
The Erythropoietin (EPO) test measures the level of erythropoietin in the blood, a hormone primarily produced by the kidneys. Erythropoietin stimulates the bone marrow to produce red blood cells in response to low oxygen levels in the body.
EPO plays a central role in maintaining adequate haemoglobin and oxygen delivery to tissues. Abnormal levels may indicate kidney-related anaemia, bone marrow disorders or inappropriate red blood cell production.
This test is commonly used alongside full blood count and iron studies to clarify the cause of anaemia or polycythaemia.
Why do I need an Erythropoietin test?
You may need this test if you have unexplained anaemia or an abnormally high red blood cell count. Measuring erythropoietin helps determine whether the kidneys are producing appropriate signals to stimulate red blood cell production.
The test also supports differentiation between primary bone marrow disorders and secondary causes related to kidney disease, oxygen deprivation or hormone dysregulation.
Symptoms and scenarios where testing is recommended:
- Unexplained anaemia
- Chronic kidney disease
- Fatigue or weakness
- Shortness of breath
- Abnormally high haemoglobin or haematocrit
- Suspected bone marrow disorders
- Investigation of polycythaemia
- Monitoring treatment affecting red cell production
Benefits of the Erythropoietin Test
- Clarifies causes of anaemia
Distinguishes kidney-related from marrow-related causes. - Assesses kidney hormone function
Evaluates erythropoietin production capacity. - Supports diagnosis of polycythaemia
Helps differentiate primary and secondary causes. - Guides appropriate treatment decisions
Supports use of EPO therapy or alternative interventions. - Complements full blood count results
Adds hormonal context to red cell abnormalities. - Useful in chronic disease monitoring
Supports ongoing management of kidney or marrow conditions. - Helps avoid misdiagnosis
Improves diagnostic accuracy in complex cases. - Simple and informative blood test
Requires only a standard venous blood sample.
Step-by-Step: How Testing Works
Choose your preferred testing method
You can attend one of our UK partner clinics or arrange a home or hotel visit with a mobile phlebotomist.
Option 1 – In-Clinic Blood Draw
- Select your nearest UK clinic and book an appointment.
- A clinician or phlebotomist collects a venous blood sample.
- The sample is analysed for erythropoietin levels.
- Results are delivered securely online.
Option 2 – Home or Hotel Phlebotomy (+£60)
- Book a UK-wide home or hotel visit at a convenient time.
- A trained phlebotomist collects your blood sample on-site.
- The sample is transported to the laboratory.
- Results are uploaded digitally without the need to travel.
Your Results Explained
Low Levels
Low erythropoietin levels may indicate kidney-related anaemia or primary bone marrow disorders.
This suggests inadequate hormonal stimulation of red blood cell production.
Typical UK reference range: ~4–27 IU/L (ranges may vary by laboratory).
Normal Levels
Normal erythropoietin levels suggest appropriate kidney response to oxygen demand.
Red blood cell abnormalities may be due to other causes such as nutrient deficiency.
High Levels
Elevated erythropoietin levels may occur in response to anaemia, chronic hypoxia or secondary polycythaemia.
Further investigation is often required to identify the underlying cause.
How It Works
Simple steps to get your results
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Choose your test online and book in seconds. Select your preferred clinic location or home visit option.
Visit or Test at Home
Attend one of our UK or London clinics, arrange a home nurse visit, or use a finger-prick kit where available.
Get Your Results
Your sample is analysed by accredited UK laboratories, with secure results delivered directly to you.
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WhatsApp UsHow to Prepare for Your Test
Follow these guidelines for accurate results
Sample Timing
Where possible, attend your blood test between 7am and 12pm. Please wait until any short-term illness or infection has fully resolved before testing. Avoid intense exercise for 24–48 hours beforehand, as this can affect certain markers.
Fasting & Hydration
Fasting is not always required, but some tests may recommend it. If fasting is advised, avoid food for 8–12 hours before your appointment and drink water only. Stay well hydrated, as this helps with sample collection and accuracy.
Medications & Supplements
Continue prescribed medications unless advised otherwise by your clinician. Avoid vitamin, mineral, or biotin supplements for at least 24–48 hours before your test, as these can interfere with results. If you are unsure about any medication or supplement, please let us know before your appointment.
Hormones & Menstrual Cycle
For hormone-related tests, timing within your menstrual cycle may be important. If relevant, follow any specific guidance provided on your test page.
If you have any questions or special circumstances, our team is happy to advise before your appointment.