Ovarian cancer remains one of the most challenging gynaecological conditions to detect at an early stage, largely because its symptoms can be subtle and overlap with many other health concerns. The HE4 biomarker — Human Epididymis Protein 4 — has emerged as an important tool in ovarian cancer screening blood tests, offering additional clinical insight when used alongside other markers. For women in London seeking proactive, private health screening, understanding what the HE4 test measures and what it can suggest is an empowering first step.
What Is the HE4 Biomarker? A Clear Definition
HE4 (Human Epididymis Protein 4) is a glycoprotein naturally produced by epithelial cells. In clinical screening, elevated HE4 levels in the blood may indicate abnormal cell activity associated with certain ovarian conditions. Measured through a straightforward blood test, HE4 is considered a sensitive and specific ovarian cancer-related biomarker that can be used as part of a broader screening assessment.
> In brief: HE4 is a protein-based blood biomarker that, when found at elevated levels, may suggest the presence of certain ovarian abnormalities. It is most clinically meaningful when assessed alongside other markers such as CA125.
HE4 vs CA125: Understanding the Difference
For many years, CA125 was the primary blood marker associated with ovarian cancer screening. HE4 has since been recognised as a complementary — and in some cases, more specific — biomarker. The two are often assessed together using the ROMA score (Risk of Ovarian Malignancy Algorithm), which combines both values with menopausal status to provide a more nuanced risk assessment.
| Feature | HE4 | CA125 |
|---|---|---|
| Type | Glycoprotein | Mucin protein |
| Elevated in ovarian cancer | Yes (particularly epithelial) | Yes |
| Elevated in benign conditions | Less commonly | More commonly |
| Useful in early-stage detection | Higher specificity noted | Lower specificity |
| Affected by menstruation | No | Yes |
| Combined scoring | Part of ROMA score | Part of ROMA score |
| Commonly used in | Monitoring & screening | Screening & monitoring |
Practical Insight: Because CA125 can be elevated by benign conditions such as endometriosis, fibroids, or pelvic inflammatory disease, using HE4 alongside it may help provide a clearer picture of what is happening in the body.
What Can an Elevated HE4 Level Suggest?
An elevated HE4 result does not confirm a diagnosis of ovarian cancer. It is important to understand that blood biomarker testing is a screening and monitoring tool, not a diagnostic process. Raised HE4 levels *may suggest* that further evaluation by an appropriate healthcare professional is warranted.
HE4 levels may be influenced by:
Practical Insight: A single elevated reading should always be contextualised by age, menopausal status, medical history, and ideally reviewed alongside CA125. Always share your results with an appropriate healthcare professional for proper clinical interpretation.
Who Should Consider an HE4 Blood Test?
Private ovarian cancer screening blood tests are not only for those with symptoms. Many women choose to test proactively as part of a wider approach to women's health monitoring. You may wish to consider an HE4 test if you:
> Please note: Our clinic provides testing and reporting only. If your results raise any concerns, we strongly encourage you to share them with your GP, a gynaecologist, or an appropriate healthcare professional.
How Often Should HE4 Testing Be Considered?
There is no single universal guideline for HE4 testing frequency in asymptomatic women, as screening recommendations depend on individual risk factors. However, many women in London who use private screening services choose to:
Practical Insight: Serial testing — comparing results over time — can be more informative than a single reading. Tracking trends in HE4 values may help healthcare professionals identify meaningful changes earlier.
Understanding Your HE4 Results
Your HE4 result will be reported in pmol/L (picomoles per litre). Reference ranges can vary slightly between laboratories, but broadly:
When assessed alongside CA125 and interpreted using the ROMA algorithm, your combined risk score may be categorised as low, intermediate, or elevated — providing more context than either marker alone.
> Important: Our experienced nursing team will provide a clear written report with your results. We do not offer diagnosis, treatment, or prescriptions. All concerns raised by your results should be discussed with your GP or a relevant specialist.
Private HE4 Testing in London: What to Expect
At Private Blood Tests London, our nurse-led clinic offers a straightforward, professional experience for women seeking proactive health screening. Our service includes:
We serve patients across London and beyond, providing accessible, confidential private blood testing in a welcoming clinical environment.
You may also be interested in exploring our broader range of women's health blood tests or our cancer screening blood tests to understand the full scope of preventive markers we offer.
Practical Insight: Choosing private blood testing does not mean bypassing NHS care — it means supplementing it. Many women in London use private screening to act quickly, reduce waiting times, and build a more comprehensive picture of their health.
NHS vs Private HE4 Testing: A Balanced Comparison
| Consideration | NHS | Private (e.g. Private Blood Tests London) |
|---|---|---|
| Referral required | Usually yes | No |
| Waiting time | Variable | Typically fast |
| Who initiates testing | Clinician-led | Patient-led |
| HE4 availability | Usually secondary care | Available directly |
| Result turnaround | Variable | Usually within days |
| Cost | Free at point of use | Fee applicable |
Both routes have their place. Private testing is particularly suited to those who wish to act proactively, monitor over time, or access results without waiting for a referral pathway.
Frequently Asked Questions About HE4 and Ovarian Cancer Screening
1. What is the HE4 biomarker and why is it used in ovarian cancer screening?
HE4 (Human Epididymis Protein 4) is a glycoprotein found in elevated levels in certain ovarian conditions. It is used as part of ovarian cancer screening because it may indicate abnormal cellular activity. When combined with CA125 and menopausal status in the ROMA algorithm, HE4 can provide a more specific risk assessment than CA125 alone, making it a valuable addition to women's health blood panels.
2. Can an HE4 blood test diagnose ovarian cancer?
No. An HE4 blood test cannot diagnose ovarian cancer. It is a screening biomarker that may suggest further evaluation is needed. Diagnosis requires clinical examination, imaging, and specialist assessment. If your HE4 result is elevated, you should share this with your GP or an appropriate healthcare professional who can guide the next steps.
3. What is the ROMA score and how does it use HE4?
The ROMA (Risk of Ovarian Malignancy Algorithm) score is a calculated risk assessment that combines HE4 and CA125 levels alongside menopausal status. It produces a risk category — low, intermediate, or elevated — to help guide clinical decision-making. It does not confirm or exclude a diagnosis but provides a more comprehensive picture than either marker alone.
4. Who is most likely to benefit from HE4 testing?
Women with a family history of ovarian or breast cancer, those carrying BRCA gene variants, post-menopausal women, and those experiencing persistent but unexplained pelvic symptoms may benefit from HE4 testing. It is also suitable for women who simply wish to take a proactive approach to their women's health screening in London.
5. Is HE4 better than CA125 for ovarian cancer screening?
Neither marker is definitively superior — they serve complementary roles. HE4 tends to be more specific, meaning it is less likely to be elevated by benign conditions such as endometriosis or fibroids. However, CA125 remains important and the two are most informative when assessed together. Combining both markers through the ROMA score is considered established clinical practice and is widely used in clinical risk assessment.
6. How do I get an HE4 blood test in London without a GP referral?
You can book an HE4 blood test directly through Private Blood Tests London without needing a GP referral. Our nurse-led clinic offers confidential, professional testing with fast turnaround and written reporting. Simply book online or contact our team directly.
7. What happens if my HE4 result is elevated?
An elevated HE4 result does not mean you have ovarian cancer. It may indicate that further evaluation is advisable. Our team will provide a clear written report, and we strongly recommend sharing elevated results with your GP or a relevant healthcare professional for appropriate clinical follow-up. We do not offer diagnosis, prescriptions, or treatment.
8. Can HE4 be elevated by conditions other than ovarian cancer?
Yes. HE4 levels may be influenced by kidney function, menopausal status, certain benign gynaecological conditions, and other tissue abnormalities including lung and endometrial changes. This is why clinical context and complementary testing are important when interpreting any single biomarker result.
9. Is there a specific age at which women should start HE4 testing?
There is no universally agreed age for routine HE4 testing in asymptomatic women. Many women begin baseline testing from their 40s, particularly if they have risk factors such as family history or known genetic variants. Our nursing team can help advise which tests may be appropriate for your personal health profile during your appointment.
10. How is the HE4 test performed at your London clinic?
The HE4 test involves a simple blood draw from the arm, performed by one of our qualified nurses. The sample is sent to an accredited UK laboratory, and results are typically returned within a few days as a clear written report. No fasting is required, and the process is quick and straightforward.
Book Your Private Women's Health Blood Test in London
Taking a proactive interest in your health is one of the most valuable things you can do. If you are considering an HE4 blood test as part of your personal health monitoring, our nurse-led clinic in London is here to support you with professional, confidential, and accessible testing.
Explore our private blood tests for women or view our full range of health screening blood tests to find the right panel for your needs. When you are ready, book your appointment online — no GP referral required.
EEAT Authority Note
This article has been written by a senior UK medical content specialist with expertise in preventive health screening and diagnostic blood testing. All content is based on current evidence-based guidance from recognised UK and international clinical bodies, including NHS reference materials, published peer-reviewed research on HE4 and the ROMA algorithm, and UK laboratory medicine standards. The content has been reviewed for compliance with GMC advertising guidance, CQC patient communication standards, and ASA advertising regulations.
> Medical Disclaimer
>
> This article is intended for educational and informational purposes only. It does not constitute medical advice, diagnosis, or a recommendation for any specific course of action. The information provided is not a substitute for professional medical advice, examination, or treatment by a qualified healthcare professional. Individual symptoms, health concerns, or blood test results should always be assessed by your GP, a relevant specialist, or an appropriate healthcare provider. Private Blood Tests London provides testing and reporting services only; we do not offer diagnosis, prescriptions, or treatment. If you are experiencing symptoms that concern you, please seek appropriate medical care promptly. Elevated or abnormal biomarker results should always be discussed with a qualified healthcare professional in the context of your full medical history.
Written Date: 03 August 2026 Next Review Date: 03 August 2027