A member asked:

How does cancer show up in blood work?

A doctor has provided 1 answer

Different ways: Tumor markers, or blood tests for certain cancers can be used for screening, or to evaluate treatment. They are not "diagnostic" of cancer, and some are more specific than others. Psa is specific for prostate cancer but elevated psa is not diagnostic for prostate ca. Cea is useful for evaluating several types of cancer once diagnosed, but isn't at all a screening test.

Answered 10/12/2019

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