PMID: 29075172Oct 28, 2017Paper

Retrospective Approach to Evaluate Interferences in Immunoassay

EJIFCC
Jayesh Warade

Abstract

Despite the increase in sensitivity and specificity of immunoassay technique over years, analytical interference remains to be major area of concern. The interfering substances are endogenous substances that are natural, polyreactive antibodies as heterophilic or auto antibodies, or human anti-animal antibodies together with other unsuspected binding proteins that are unique to the individual. Interfering substances can interfere with the reaction between analyte and reagent antibodies in immunoassay resulting in false positive or negative values. This ultimately results in misinterpretation of patients reports and finally to wrong course of treatment. In our study, we used a retrospective approach to find out the extent of interferences and type of interferences in some cases during our routine practice. The immunoassay reports which were clinically not correlating were retrospectively evaluated after discussion with the clinician. Over a period of six month a total of 42 samples were evaluated for interference for different immunoassay parameters such as Beta HCG, Estradiol, CA 125, AFP, prolactin, Hepatitis B Surface antigen (HbSAg) and troponin I. The samples were treated with commercially available antibody blocking agents...Continue Reading

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