Evaluation of five gentamicin assay procedures for clinical microbiology laboratories

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Abstract
Five gentamicin assay procedures (a bioassay, an enzyme immunoassay, a latex agglutination inhibition test, a fluorescence immunoassay and a radioimmunoassay) were evaluated to determine which was optimal. The evaluation was based on recovery and precision studies and results of analyses of patient samples, as well as technical assay performance factors. The latex agglutination inhibition test appears useful for laboratories performing only occasional assays for gentamicin; the fact that some rheumatoid factor-positive sera, as well as some other sera for unknown reasons, may give falsely low values is a potential drawback to this procedure. Because of its accuracy, precision, rapid turn-around time and relative simplicity of performance, the enzyme immunoassay procedure was selected for routine use for gentamicin assays.

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