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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.

With the exception of blood cancers, blood tests generally can't absolutely tell whether you have cancer or some other noncancerous condition, but they can give your doctor clues about what's going on inside your body.

Because your doctor has ordered cancer blood tests to look for signs of cancer, it 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.