The Biomedical Mass Spectrometry Facility is an instrumentation laboratory that offers mass spectrometry services to the University of Michigan Medical School and the research community on a recharge basis. The Facility provides access to modern mass spectrometric techniques and state-of-the-art instrumentation to address a wide range of research problems. The focus of the laboratory is on the characterization and quantification of small molecules with special emphasis on biomarkers, drugs, and drug metabolites. The Facility offers training for independent operation of instruments as well as sample analysis by Facility personnel.