Abstract:Introduction: Chromogranin A (CGA) is a glycoprotein secreted by several neuroendocrine tissues; therefore, it is a good marker for neuroendocrine tumors, with high specificity for diagnosis and good correlation with disease progression, recurrence and treatment response. Several conditions may lead to "falsely elevated" values of this marker, but reports of occurrence of "falsely low" values due to the hook effect are rare. We report this effect detected in the laboratory evaluation of a patient with neur… Show more
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