No. Blood tests alone cannot diagnose lung cancer. However, some findings on blood tests in combination with specific symptoms can raise the suspicion of lung cancer. The main purpose of blood tests in lung cancer is to check whether a person is healthy enough to undergo surgery.
A healthcare professional can perform a complete blood count (CBC) test or blood chemistry test. CBC test determines the count of different blood cells a person has. A person with lung cancer may have altered counts of the blood cells but are usually non-specific and cannot aid in the diagnosis of lung cancer.
Likewise, the blood chemistry test can find anomalies in the organs but these too are nonspecific and do not help with cancer diagnosis. In patients already diagnosed with lung cancer, these tests can raise suspicion of cancer spread to different organs.
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