Positive Ana And Antigen

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Carcinoembryonic antigen (CEA) is an antigen (protein) present in very small quantities in adult tissue. A greater than normal amount may be suggestive of cancer. Normally, its values range from 0.0 to 2.5 nanograms per milliliter of serum (from blood), in non-smokers. CEA levels are higher, on average, in men, smokers, and older individuals.

Tests for its presence aid in screening, in evaluating recurrent or disseminated disease, and in gauging the success of surgical removal of malignant...

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