Evaluation of the Bactec serum gentamicin assay

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Abstract
A radiometric assay for gentamicin was compared with an established radioimmunoassay protocol. The coefficients of variation for within-run, day-to-day, and overall runs were consistently higher for the radiometric method as compared with the radioimmunoassay. The coefficient of correlation for 84 patient sera tested by the two methods for gentamicin levels was 0.82. Though less precise, the radiometric method was felt to be an acceptable means of determining gentamicin levels in laboratories where the radioimmunoassay is unavailable.