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Abstract
Diagnostic test interference is due to the presence of material that falsely changes an analytic test result. The development of monoclonal antibodies is discussed with focus on their extensive use as both therapeutic and diagnostic agents. In this review the interference of monoclonal antibodies with laboratory test methods and the potential impact on clinical care is addressed. Recognition of the types of interference, endogenous and exogenous, and the varied mechanisms by which monoclonal antibodies may cause interference are discussed in this report. Review of the literature identifies cases which exemplify the issues facing laboratorians and clinicians and describe the impact on patients. Approaches to reducing and eliminating sources of interference are also addressed. Education of ordering clinicians concerning the possibility of interference in at-risk patients is key in limiting the impact on care. Laboratorians and medical practitioners should be cognizant of the risk of interference to avoid incorrect management of patients.