Ovarian cancer screening tests in the UK are blood-based assessments — most commonly the CA-125 blood test — used to help identify potential markers that may be associated with ovarian changes. While no single test can diagnose ovarian cancer, screening can provide valuable information that supports informed conversations with appropriate healthcare professionals.
For women across London and the wider UK who want a proactive approach to their reproductive health, understanding what ovarian cancer screening involves — including what tests are available, who may benefit, and what results can suggest — is an important first step.
Keyword Context
What Is the CA-125 Blood Test? (Definition)
> The CA-125 blood test measures the level of a protein called Cancer Antigen 125 in the bloodstream. Elevated CA-125 levels may sometimes be associated with ovarian conditions, including benign and malignant changes. It is one of several tools used in ovarian health assessment and is most useful when interpreted alongside clinical history.
CA-125 is a glycoprotein naturally produced by certain cells in the body. While it is often associated with ovarian cancer discussions, it is important to understand that raised CA-125 levels can occur in a wide range of situations — including endometriosis, fibroids, pelvic inflammatory disease, and even menstruation. This is why the test is considered a marker for investigation, not a diagnostic tool on its own.
Is There a National Ovarian Cancer Screening Programme in the UK?
At present, there is no routine NHS ovarian cancer screening programme for the general female population in England. This differs from cervical and breast screening, which have established national programmes.
Research — including the large-scale UKCTOCS trial published in *The Lancet* — has explored whether CA-125 and ultrasound-based screening strategies could reliably reduce ovarian cancer mortality at a population level. While results have informed clinical guidelines, a universal NHS screening programme has not yet been introduced.
This means that for many women who want proactive monitoring — particularly those with a family history or personal risk factors — private blood testing may offer a practical and accessible option to assess relevant biomarkers.
Practical Insight: The absence of a national programme does not mean testing is unavailable. Private nurse-led clinics in London can provide CA-125 blood testing as part of a women's health screening approach.
What Does the CA-125 Test Measure and Why Does It Matter?
| Biomarker | What It May Indicate | Important Context |
|---|---|---|
| CA-125 (Cancer Antigen 125) | May be elevated in ovarian conditions | Can also rise in endometriosis, fibroids, PID, pregnancy |
| HE4 (Human Epididymis Protein 4) | Sometimes used alongside CA-125 | More specific, less commonly available privately |
| ROMA Score | Combines CA-125 + HE4 | Used in some clinical risk stratification pathways |
CA-125 is the most widely available and clinically referenced tumour marker in the context of ovarian health. When results are reviewed in context — factoring in age, menopausal status, symptoms, and personal history — they may suggest whether further assessment is appropriate.
Practical Insight: A single elevated result does not confirm any condition. Equally, a result within the normal reference range does not entirely exclude all possibilities. Results should always be reviewed with an appropriate healthcare professional.
Who Should Consider an Ovarian Cancer Screening Blood Test?
While testing may be relevant to a broad range of women, the following groups are often most motivated to explore CA-125 testing:
This is not an exhaustive list. Women of any age may wish to include CA-125 testing as part of a broader women's health blood test panel for their own awareness and peace of mind.
How Often Should You Have an Ovarian Cancer Marker Test?
There is no universally fixed frequency for CA-125 testing outside of clinical management pathways. However, the following general guidance is commonly referenced in educational contexts:
If you are uncertain how frequently testing may be appropriate for your circumstances, discussing this with a nurse at your testing clinic or seeking advice from a relevant healthcare professional is the recommended route.
What Do CA-125 Results Mean?
Understanding CA-125 reference ranges helps contextualise results appropriately:
It is important to note that normal ranges can vary slightly between laboratories. Your results report will include the reference range used by that specific facility.
Practical Insight: Menopausal status is a significant factor. Post-menopausal women generally have naturally lower baseline CA-125 levels, so even modestly elevated results may carry greater clinical relevance in this group.
For a broader understanding of how blood markers relate to overall health, our cancer marker blood tests page provides further educational context.
Private Ovarian Cancer Screening in London: What to Expect
At Private Blood Tests London, our nurse-led clinic provides straightforward, professional blood testing in a comfortable environment. Here is what the process typically involves:
1. Booking — You can book your CA-125 blood test online or by contacting the clinic directly
2. Sample collection — A qualified nurse takes a small blood sample; the process takes only a few minutes
3. Laboratory analysis — Your sample is processed by an accredited UK laboratory
4. Results reporting — You receive a clear, written results report, typically within 24–48 hours
5. Next steps — If results suggest further review may be appropriate, you will be guided to seek advice from an appropriate healthcare professional
Our clinic provides testing and reporting only. We do not offer prescriptions, treatment, or specialist referrals. Our role is to give you accurate, timely information to support your health awareness.
London's position as a hub for private healthcare means accessible, high-quality blood testing is available without long waiting times. Whether you are based in Central London, North London, or commuting from surrounding areas, private testing can fit around your schedule.
NHS vs. Private Ovarian Cancer Screening: A Practical Comparison
| Factor | NHS (Clinical Pathway) | Private Nurse-Led Clinic |
|---|---|---|
| Availability | Symptom or risk-led referral required | Available to book directly |
| Waiting times | Variable; can be weeks to months | Typically same week or next day |
| Cost | Free at point of access | Fee applies (see website for current pricing) |
| Scope | GP-guided clinical assessment | Blood testing and results reporting only |
| Results turnaround | Varies by pathway | Typically 24–48 hours |
Both routes have distinct value. Private testing is not a replacement for NHS care; rather, it can complement it by providing timely information that may inform your next steps.
Explore our full range of private women's health blood tests to see what may be relevant to your circumstances.
Frequently Asked Questions
What is an ovarian cancer screening test in the UK?
An ovarian cancer screening test in the UK most commonly refers to the CA-125 blood test, which measures a protein that may be elevated in certain ovarian conditions. There is currently no national NHS screening programme for the general population, but private blood testing is available for women who want proactive monitoring. The test is educational and should be reviewed alongside personal and clinical history.
Can a blood test detect ovarian cancer?
No blood test can definitively diagnose ovarian cancer. The CA-125 test measures a protein marker that can sometimes be elevated in ovarian conditions, but it can also rise in benign conditions such as endometriosis, fibroids, or during menstruation. Results are best understood as one part of a broader health picture and should be reviewed with an appropriate healthcare professional.
What is a normal CA-125 level in the UK?
Most UK laboratories use a reference range of below 35 U/mL as the normal threshold for CA-125. However, normal ranges may vary slightly between laboratories, and results must be interpreted in context — including age, menopausal status, and any relevant symptoms or health history.
Who should consider a CA-125 ovarian cancer screening test?
Women with a family history of ovarian or BRCA-related cancers, women over 50 (particularly post-menopausal), and those seeking proactive women's health screening may consider CA-125 testing. It is also sometimes considered by women who have experienced persistent symptoms such as unexplained bloating or pelvic discomfort, as a way of gathering useful health information.
How often should I have an ovarian cancer blood test?
There is no single universally recommended frequency for CA-125 testing outside of a clinical management pathway. Some women choose annual testing for ongoing awareness, while others may test more or less frequently based on personal risk. Following guidance from a healthcare professional is always advisable when determining appropriate testing intervals.
Is the CA-125 test available on the NHS?
CA-125 testing is available on the NHS, but it is typically offered within a specific clinical pathway — usually when a GP refers a patient based on symptoms or risk factors. For women who want proactive access without waiting for a GP referral, private blood testing provides a direct and accessible alternative.
Can CA-125 be elevated for reasons other than ovarian cancer?
Yes. CA-125 can be elevated in a wide range of benign and non-cancerous conditions, including endometriosis, uterine fibroids, pelvic inflammatory disease, peritonitis, and even normal menstruation or pregnancy. This is why CA-125 results are never interpreted in isolation and should always be contextualised within a broader clinical picture.
How quickly will I get my results from a private ovarian screening blood test in London?
At Private Blood Tests London, most blood test results — including CA-125 — are typically available within 24–48 hours of your sample being taken. You will receive a written results report, and our team can advise you on appropriate next steps if your results suggest further review may be beneficial.
Does a normal CA-125 result mean I don't have ovarian cancer?
A CA-125 result within the normal reference range is generally reassuring, but it does not completely rule out all ovarian conditions. Some ovarian cancers, particularly in early stages, may not cause elevated CA-125. This is one reason why ongoing awareness, regular health screening, and prompt follow-up of any persistent symptoms remain important alongside testing.
Where can I get an ovarian cancer screening blood test in London?
Private Blood Tests London offers CA-125 blood testing through our nurse-led clinic. You can book directly online or by contacting us. We provide professional sample collection and results reporting in a comfortable, confidential setting. Visit our private blood tests booking page to find out more about availability and current test options.
Taking a Proactive Approach to Your Ovarian Health
Ovarian health awareness is a meaningful part of overall wellbeing for women at any stage of life. Whether you have specific concerns, a family history that encourages vigilance, or simply want to take a more informed role in your preventive health, a CA-125 blood test can provide useful baseline information.
At Private Blood Tests London, our nurse-led team is here to support your health awareness through accurate, professional blood testing — without pressure or unnecessary complexity. We provide clear results reporting so you can make informed decisions, in your own time, with the right support around you.
If you are ready to take a proactive step, explore our private women's health and cancer marker blood tests and book at a time that suits you.
Educational Disclaimer
This article is intended for educational and informational purposes only. The content does not constitute medical advice, diagnosis, or treatment recommendations. Ovarian cancer screening test results, including CA-125 blood test findings, should always be reviewed and interpreted by an appropriate healthcare professional in the context of your individual health history, symptoms, and clinical circumstances.
Private Blood Tests London is a nurse-led clinic that provides blood testing and results reporting only. We do not offer prescriptions, treatment, or specialist referrals. If you have concerns about your health, persistent symptoms, or any test results, please seek advice from a qualified healthcare professional or, if symptoms are severe, contact urgent medical care.
No outcome guarantees are made or implied in this article. Individual results will vary based on personal health factors. Reference ranges and clinical guidance are subject to change in line with evolving UK medical evidence and national guidelines.
Written Date: 30 June 2026 Next Review Date: 30 June 2027