S3A Guidance: Note for Guidance on Toxicokinetics: The Assessment of Systemic Exposure in Toxicity Studies: Focus on Microsampling-Questions and Answers; International Council for Harmonisation; Guidance for Industry; Availability

The Food and Drug Administration (FDA or Agency) is announcing the availability of a guidance entitled ``S3A Guidance: Note for Guidance on Toxicokinetics: The Assessment of Systemic Exposure in Toxicity Studies: Focus on Microsampling--Questions and Answers.'' The guidance was prepared under the auspices of the International Council for Harmonisation (ICH), formerly the International Conference on Harmonisation. This question-and-answer (Q&A) guidance provides additional information to facilitate interpretation of the guideline for industry ``S3A Toxicokinetics: The Assessment of Systemic Exposure in Toxicity Studies'' (S3A guidance), especially to address the benefit and use of microsampling techniques in main study animals. The Q&A guidance is intended to provide points to consider before incorporating the microsampling method in toxicokinetic studies and acknowledges the benefits (and some limitations) of the use of microsampling.