RT Book, Section A1 McClean, Michael D. A1 Webster, Thomas F. A2 Wallace, Robert B. SR Print(0) ID 1141968734 T1 Biomarkers T2 Maxcy-Rosenau-Last Public Health and Preventive Medicine, 15e YR 2017 FD 2017 PB McGraw-Hill Medical PP New York, NY SN 9780071441988 LK accessbiomedicalscience.mhmedical.com/content.aspx?aid=1141968734 RD 2024/04/19 AB Biological markers, or biomarkers, are indicators of events occurring in a biological system. While exposure refers to contact between a substance and the surface of the human body via inhalation, ingestion, or dermal contact, biomarkers provide information about the activity of a substance once it is absorbed. Whether the agent of interest is the original substance to which the individual was exposed or a metabolite, biological monitoring can provide useful information about exposure, early health effects, and susceptibility. Figure 22-1 presents a conceptual model for exposure-related disease.