1. S3A guidance: note for guidance on toxicokinetics : the assessment of systemic exposure in toxicity studies : focus on microsampling : questions and answers Publication: Silver Spring, MD : Center for Drug Evaluation and Research, May 2018 Subject(s): Blood Specimen Collection -- methodsDrug Evaluation, Preclinical -- methodsPharmaceutical Preparations -- administration & dosageSample SizeToxicity Tests -- methodsToxicokineticsPharmacokineticsResearch DesignHumansUnited StatesUnited States. Department of Health and Human Services.United States. Food and Drug Administration.