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CA-125 was initially detected using the murine monoclonal antibody designated OC125. Robert Bast , Robert Knapp and their research team first isolated this monoclonal antibody in 1981. [ 28 ] The protein was named "cancer antigen 125" because OC125 was the 125th antibody produced against the ovarian cancer cell line that was being studied.
CA-125 levels are not accurate in early stage ovarian cancer, as half of stage I ovarian cancer patients have a normal CA-125 level. [ 31 ] [ 29 ] CA-125 may also be elevated in benign (non-cancerous) conditions, including endometriosis , pregnancy , uterine fibroids , menstruation , ovarian cysts , systemic lupus erythematosus , liver disease ...
Reference ranges (reference intervals) for blood tests are sets of values used by a health professional to interpret a set of medical test results from blood samples. Reference ranges for blood tests are studied within the field of clinical chemistry (also known as "clinical biochemistry", "chemical pathology" or "pure blood chemistry"), the ...
The reason is that the test may be falsely normal (false negative) in many cases or abnormally elevated in people who have no cancer (false positive) in others. The main use of CA19-9 is therefore to see whether a pancreatic tumor is secreting it; if that is the case, then the levels should fall when the tumor is treated, and they may rise ...
The standard definition of a reference range for a particular measurement is defined as the interval between which 95% of values of a reference population fall into, in such a way that 2.5% of the time a value will be less than the lower limit of this interval, and 2.5% of the time it will be larger than the upper limit of this interval, whatever the distribution of these values.
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]
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