May still be normal: CEA cant be used for dx but only for monitoring the presence of a known malignancy with normal levels occassionaly reaching 10ugms. A normal value of CEA is a range from 0 to 2.5 (mcg/L). For a smoker, expected levels of CEA range from 0 to 5.0 (mcg/L). High levels may be an indication of cancer, but some will test high, even though they do not have cancer.
Answered 1/23/2015
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