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The recovery rate of gentamicin and tobramycin from uraemic sera was between 50 and 70% using a bioassay method which gave a 90% recovery rate from normal sera. This difference was not seen with streptomycin or kanamycin. The recovery rate from uraemic sera could be raised to clinically acceptable levels of above 80% either by using a different assay medium or by preparing standard solutions in pooled uraemic sera.
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