Yes, blood tests can identify the presence of cancer in the body, but they are not often used to make a diagnosis. They are more of a tumor marker test, which identifies proteins or substances that are produced by cancer cells, or DNA fragments that are released into the bloodstream by tumors. Some examples of blood tests include the Complete Blood Count test for blood cancers and tumor marker tests for cancers of specific organs, such as the PSA test for prostate cancer or the CA-125 test for ovarian cancer.
According to Dr. Sandeep Nayak, an experienced surgical oncologist,
“Blood tests are a useful first step in cancer detection they do not confirm cancer on their own, but they guide us toward the right investigations and help us act faster when something needs attention.”
Which Blood Tests Help Detect Cancer in the Body?
Several types of blood tests are used in oncology to identify signs of cancer or assess the risk of its presence.
- Tumour Marker Tests: These measure specific proteins produced by cancer cells, such as PSA for prostate cancer, CA-125 for ovarian cancer, and CEA for colorectal cancer.
- Complete Blood Count (CBC): A routine CBC can reveal abnormal levels of red cells, white cells, or platelets that may suggest leukaemia or other blood-related cancers.
- Liver Function Tests: Elevated liver enzymes in a blood panel can indicate liver cancer or cancer that has spread to the liver from another site in the body.
- Lactate Dehydrogenase (LDH): High LDH levels in the blood are associated with lymphoma, testicular cancer, and other rapidly growing tumours in the body.
Adopting healthy lifestyle habits and staying proactive with regular screenings can significantly reduce cancer risk. You can also learn practical ways to prevent cancer through informed choices that support long-term health and early detection.
What Are the Limitations of Using Blood Tests for Cancer Detection?
Blood tests are a helpful tool in cancer detection but come with important limitations that every patient must understand before drawing conclusions.
- Not Conclusive Alone: Elevated tumour markers can be caused by non-cancerous conditions such as infections, inflammation, or benign cysts a biopsy is always needed for confirmation.
- False Positives: Some blood tests produce abnormal results in healthy individuals, causing unnecessary anxiety and leading to invasive investigations that may not be needed.
- False Negatives: Early stage cancers may not yet produce detectable levels of tumour markers, meaning a normal blood result does not fully rule out cancer.
- Cancer Specific Limitations: Most blood tests are designed to detect one specific cancer type and cannot screen for multiple cancers in a single test result.
These limitations can cause emotional stress and anxiety for patients and families. Read more about how cancer testing affects mental health and coping strategies.
Why Choose MACS Clinic for Cancer Detection and Treatment?
MACS Clinic in Bangalore is known for providing some of the best cancer treatment in Bangalore, combining advanced surgical expertise with patient-focused care. The clinic specializes in minimally invasive and robotic cancer surgeries that support faster recovery, less pain, and shorter hospital stays.
Led by experienced surgical oncologists including Dr Sandeep Nayak, MACS Clinic provides personalized cancer treatment tailored to each patient’s condition. Supported by a multidisciplinary team and modern technology, the clinic ensures precise treatment and better long-term outcomes.
Book your consultation for cancer treatment at MACS Clinic, Bangalore.
FAQs
Can a normal blood test result mean I do not have cancer?
A normal blood test reduces suspicion but does not rule out cancer entirely. Further investigation is needed if symptoms persist or risk factors are present.
How accurate are tumour marker blood tests for cancer detection?
Tumour marker tests vary in accuracy depending on cancer type. They are most useful for monitoring known cancer rather than screening for new cases independently.
Which cancers can be most reliably indicated through blood tests?
Leukaemia, lymphoma, prostate, ovarian, and colorectal cancers have relatively well-established blood markers that help guide diagnosis alongside imaging and biopsy.
How often should I get blood tests done if cancer runs in my family?
Patients with a family history of cancer should discuss a personalised screening schedule with an oncologist to determine the right tests and frequency for their situation.