Maybe: If the blood is gotten to the lab fairly quickly, it might reveal cancer cells. But the absence of cancer cells doesn't mean you don't have cancer. Spitting up blood, especially when it has been going on for a while, would be a reason to go through further tests to find out where it is coming from, and what is causing it. A lab exam of bloody sputum is not the way to go.
Answered 1/25/2018
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