What Happens If a Multi Cancer Early Detection (MCED) Test Result Is Positive?
Multi Cancer Early Detection (MCED) tests are blood-based screening tests designed to detect signals associated with multiple types of cancer. These tests analyse circulating biomarkers that may be released by cancer cells. Some individuals consider MCED testing as an additional layer of cancer screening beyond national screening programmes such as mammography, cervical screening, and colorectal screening.
A common concern among patients is how to interpret a positive MCED result. Understanding what the result means, the likelihood of cancer, and the next steps in evaluation can help patients approach follow-up investigations in a structured and informed way.
Definition: Positive MCED Result
A positive MCED result, sometimes described as “cancer signal detected,” means the test has identified a biological pattern in the blood that may be associated with cancer.
It does not confirm that cancer is present. Instead, it indicates that additional diagnostic tests are required to determine whether cancer exists and where it may originate.
What Happens After a Positive MCED Test Result?
A positive MCED result is usually followed by clinical review and targeted diagnostic investigations. The goal is to determine whether cancer is present and to identify the possible location of the tumour.
Typical next steps may include:
- Consultation with a doctor to review the report
- Assessment of medical history and symptoms
- Review of family history of cancer
- Evaluation of the predicted tissue of origin provided by the MCED report
- Planning of targeted diagnostic investigations
Depending on the clinical assessment, further tests may include:
- CT scan or MRI
- Ultrasound imaging
- Endoscopy (such as colonoscopy or gastroscopy)
- Organ-specific screening tests
- Additional blood tests or tumour markers
These investigations help confirm whether the signal detected by the MCED test corresponds to an identifiable tumour.
Who Should Proceed With Further Evaluation After a Positive MCED Result?
Individuals with a positive MCED result should generally undergo further evaluation with a doctor.
Follow-up assessment is particularly important for:
- Adults aged 40 years and above
- Individuals with family history of cancer
- People with unexplained symptoms such as weight loss or persistent fatigue
- Individuals with known cancer risk factors (e.g. smoking, chronic liver disease)
- Patients whose MCED test identifies a likely tissue of origin
The purpose of follow-up testing is to clarify whether the detected signal represents a real cancer finding or another biological cause.
Who May Not Require Immediate Extensive Investigations?
In some situations, the doctor may recommend a stepwise approach rather than immediate invasive testing.
Examples include:
- Patients with very low overall cancer risk
- Cases where initial imaging tests are normal
- Situations where the predicted cancer signal probability is low
- Patients without symptoms or suspicious findings on clinical assessment
In such cases, doctors may consider:
- Periodic monitoring
- Repeat imaging after a defined interval
- Continued routine cancer screening
The management plan is individualised based on clinical judgment.
Potential Benefits of Early Follow-Up After a Positive MCED Result
Following up on a positive MCED result may offer several potential advantages.
Possible benefits include:
- Identification of cancers at an earlier stage
- Detection of cancers without existing screening programmes
- Ability to perform targeted diagnostic imaging
- Improved understanding of individual cancer risk
However, it is important to recognise that further testing is necessary to determine whether cancer is actually present.
Limitations and Risks of a Positive MCED Result
MCED tests are screening tools and have several important limitations.
These include:
- False positive results, where no cancer is found
- False negative results, where cancer may still be present despite a negative test
- Not all cancers release detectable signals into the bloodstream
- The predicted tissue of origin may not always be accurate
- Follow-up investigations may require additional procedures
Because of these factors, MCED tests should be interpreted as screening results rather than diagnostic confirmation.
What Happens During the Follow-Up Appointment?
After receiving a positive MCED result, patients will typically attend a consultation to review the findings.
A typical follow-up visit may involve:
- Registration and review of the MCED report
- Medical consultation to assess personal and family history
- Physical examination, if relevant
- Discussion of recommended diagnostic investigations
- Referral for imaging or specialist evaluation, if necessary
The time required to complete investigations may range from several days to a few weeks, depending on the tests required.
How Much Do Follow-Up Investigations Cost in Singapore?
The cost of evaluation after a positive MCED result depends on the investigations required.
Typical components of cost may include:
- Doctor consultation fees
- Diagnostic imaging (CT scan, MRI, ultrasound)
- Endoscopy procedures if indicated
- Specialist consultations
In Singapore, the total cost of follow-up investigations may range from SGD 600 to SGD 4,000, depending on complexity and healthcare setting.
Patients are usually advised to discuss estimated costs with their doctor before proceeding with investigations.
How Does MCED Compare With Standard Cancer Screening?
| Feature | MCED blood test | Standard cancer screening |
| Screening method | Blood test | Imaging or procedure |
| Coverage | Multiple cancer types | Specific organs |
| Diagnostic capability | Screening only | Some test leads to biopsy |
| Role | Additional screening layer | Recommended population screening |
| Replacement for screening | No | Remains necessary |
Frequently Asked Questions
Does a positive MCED result mean I have cancer?
No. A positive result means the test detected a pattern that may be associated with cancer. It does not confirm a diagnosis. Further diagnostic tests are needed to determine whether cancer is present.
How accurate are MCED tests?
The accuracy of MCED tests varies depending on the tests carried out. Currently, Spot-Mas sensitivity is 70-78% and specificity is 99%, whereas Lucence sensitivity is 80.9% and specificity is 99%.
What tests are usually done after a positive MCED result?
Follow-up tests depend on the suspected tissue of origin and clinical assessment. These may include CT scans, MRI scans, ultrasound imaging, colonoscopy, gastroscopy, or other organ-specific investigations.
How long does the diagnostic process take?
It typically takes about 12 working days for the results to be released.
What happens if doctors cannot find cancer?
If no cancer is detected after evaluation, doctors may recommend monitoring, repeat imaging after a period of time, or continuing routine cancer screening. Management is individualised based on risk profile.
Can MCED replace mammograms or colonoscopy?
No. MCED testing does not replace established screening programmes such as mammography, cervical screening, or colorectal screening. These tests remain recommended according to national guidelines.
How often should MCED screening be performed?
The optimal frequency of MCED screening is to be performed annually. Some individuals may consider repeating the test periodically based on medical advice and personal risk factors.
Is a positive MCED result an emergency?
Most positive results require timely follow-up but are not considered medical emergencies. Patients should arrange a consultation with a doctor to review the findings and plan further investigations.
Summary: What Should You Do If Your MCED Result Is Positive?
A positive MCED result means that the test detected a biological signal associated with cancer. However, the result does not confirm a cancer diagnosis. The next step is to consult a doctor who can review the report, assess individual risk factors, and arrange appropriate diagnostic investigations. MCED testing is designed to complement existing screening programmes and should be interpreted alongside clinical evaluation.
If you are considering early cancer screening, services are available at Minmed Clinics and Minmed Screening Centres. Speak to our doctors to understand which option is suitable for you and your family.
🔗 Find out more about multi-cancer early screening services
Medical Review & Authorship
This page is medically reviewed by:
Dr Ng Han Xian
MBBS, GDFM (Family Medicine)
Minmed Group Medical Doctor
The information provided is for general educational purposes and does not replace an individual medical consultation.
Last updated: September 2026