1 doctor weighed in:

How does cancer show up in blood work?

1 doctor weighed in
Dr. Lawrence Hochman
Radiation Oncology

In brief: 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.

In brief: 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.
Dr. Lawrence Hochman
Dr. Lawrence Hochman
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