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Testing of CA-125 blood levels has been proposed as useful in treating ovarian cancer. While the test can give useful information for women already known to have ovarian cancer, CA-125 testing has not been found useful as a screening method because of the uncertain correlation between CA-125 levels and cancer. [19]
No screening test is wholly specific, and a high level of tumor marker can still be found in benign tumors. The only tumor marker currently used in screening is PSA (prostate-specific antigen). Diagnostics; Tumor markers alone can't be used for diagnostic purposes, due to lack of sensitivity and specificity. [4]
Measurements of blood CA125 levels are used to determine patient response to the treatment. Between 20% and 30% of patients relapse within six months of treatment. [52] Poly ADP ribose polymerase (PARP) inhibitors are another possible treatment, with carriers of BRCA1/2 mutations being the most responsive [53] [54]
The recommendation as of 2014 is recurrent cancer may be present if the CA-125 level is twice normal. [28] Treating a recurrence detected by CA-125 does not improve survival. [31] For women with germ-cell tumors, follow-up tests generally include alpha-fetoprotein (AFP) and/or human chorionic gonadotropin.
The CEA blood test is not reliable for diagnosing cancer or as a screening test for early detection of cancer. [8] Most types of cancer do not result in a high CEA level. [9] Serum from individuals with colorectal carcinoma often has higher levels of CEA than healthy individuals (above approximately 2.5ng/mL). [10]
For the majority of tests, blood is usually obtained from the patient's vein. Other specialized tests, such as the arterial blood gas test, require blood extracted from an artery. Blood gas analysis of arterial blood is primarily used to monitor carbon dioxide and oxygen levels related to pulmonary function, but is also used to measure blood pH ...
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