What does a CA 27-29 test measure?

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A CA 27-29 test is primarily used as a tumor marker in monitoring patients with breast cancer. It measures the levels of a specific protein that can be elevated in the blood of individuals with breast cancer, particularly in those with advanced disease. This test is not used for the initial diagnosis of breast cancer but can provide valuable information regarding the effectiveness of treatment and can help in assessing cancer recurrence.

The utility of CA 27-29 lies in its role as a part of the overall management of breast cancer, allowing healthcare providers to monitor the disease's progression or response to therapies. Elevated levels may indicate increased disease activity, thereby assisting clinicians in making informed decisions about subsequent care options.

In contrast, other options refer to tests that measure different conditions or biochemical markers. For instance, tests that indicate colorectal cancer examine other tumor markers like CEA (carcinoembryonic antigen). Measures of metabolic acid levels pertain to evaluating acid-base balance in the body, while liver function tests assess enzymes and proteins produced by the liver, unrelated to breast cancer monitoring. Thus, the correct answer accurately reflects the specific purpose of the CA 27-29 test in the context of breast cancer management.

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