Assertion: protein marker | /r/HasProperty | performed on cerebrospinal fluid
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text: Your doctor will take a sample of your bodily fluid or tumor tissue and send it to the laboratory to measure the level of the tumor marker.﻿﻿ With protein tumor markers, tests are most often done on blood, but they may also be performed on urine, stool, cerebrospinal fluid, peritoneal fluid (abdominal fluid), or pleural fluid.