Dr Terence Hetzel is a laboratory manager in the field of bioanalytics at the GLP testing facility at Bayer AG. In this online presentation, he gives a comprehensive insight into the bioanalytics of various therapeutic modalities. By way of introduction, this presentation first clarifies what bioanalytics is and defines the terms pharacokinetics and pharmacodynamics as well as their interaction. Hetzel shows how diverse the application of bioanalytics is, which different modalities can be analysed and which analytical challenges arise due to this diversity. The theory is illustrated in the presentation with use cases.