Bioanalytical reports are usually written by bioanalysts. Medical writers offer a valuable contribution to bioanalytical reporting, increasing the efficiency of document development and improving the quality of data presentation. This article covers essential aspects of reporting bioanalytical results, including the key parameters of bioanalysis, regulatory requirements, and the content and structure of bioanalytical reports. It will also be of interest to medical writers who deal with bioequivalence and other pharmacokinetic trials.