Can blood tests detect cancer?

Once cancer is diagnosed, a person’s entire mental world may collapse, and the impact on the family can also be profound. Therefore, it is essential to focus on cancer prevention and regular screening in daily life. Early detection and timely treatment can significantly reduce harm. So, can blood tests detect cancer? Below, we address this question.

Can blood tests detect cancer?

In general, blood tests can detect certain types of cancer, but some cancers cannot be identified through blood testing alone. Cancer develops gradually, and symptoms in its early stages are often subtle and easily overlooked. Although blood tests include measurements of various enzyme levels that may indicate the presence of certain cancers, relying solely on blood tests for cancer diagnosis is scientifically unsound. Blood tests constitute only one component of the diagnostic criteria—not a standalone method—for confirming cancer; additional diagnostic tools are required to support the diagnosis.

Thus, claiming that cancer can be definitively diagnosed based on a single test is inaccurate. While blood tests can identify certain cancers—such as leukemia—many other cancers cannot be detected this way and require further evaluation using imaging techniques like CT scans or ultrasound.

Knowledge Expansion: Strategies for Cancer Prevention

1. Maintain a Healthy Lifestyle

A portion of cancer cases stem from unhealthy lifestyle habits. Therefore, after surgical treatment, patients aiming to prevent cancer recurrence must adopt and sustain healthy habits—such as avoiding smoking, excessive alcohol consumption, staying up late, and binge eating. Additionally, regular physical exercise and maintaining an optimistic, positive mindset are crucial. Exercise not only boosts immune function but also helps regulate mood and relieve stress. After full postoperative recovery, patients should continue exercising regularly.

2. Undergo Regular Screening

Given cancer’s potential for recurrence and metastasis, clinical oncology uses metrics such as 3-year and 5-year survival rates. These statistics reflect that even after surgery and other treatments, cancer may still recur, metastasize, or lead to death. True cancer cure is not confirmed merely by the absence of tumors within three to five years post-surgery. To prevent recurrence, cancer patients must adhere strictly to their physicians’ recommendations for scheduled follow-up examinations.

The above provides an overview of whether blood tests can detect cancer. We hope this information is helpful to you.