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Cancer blood tests and other laboratory tests may help your doctor make a cancer diagnosis. Blood tests alone can rarely, if ever, show the presence or absence of cancer. If it's suspected that you have cancer, your doctor may order certain cancer blood tests or other laboratory tests, such as an analysis of your urine or a biopsy of a suspicious area, to help guide the diagnosis.

While cancer blood tests generally can't absolutely tell whether you have cancer or some other noncancerous condition, they can give your doctor clues about what's going on inside your body. Because your doctor has ordered cancer blood tests or other laboratory tests to look for signs of cancer doesn't mean that a cancer diagnosis has been made and you have cancer.

Find out what your doctor might be looking for when cancer blood tests are done. Samples collected with cancer blood tests or other tests of urine, fluid or tissue are analyzed in a lab for signs of cancer. The samples may show cancer cells, proteins or other substances made by the cancer. Blood and urine tests can also give your doctor an idea of how well your organs are functioning and if they've been affected by cancer.

Before you order a test please read this article at - Mayo Clinic Health Solutions.
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