Biomonitoring is the measurement of chemicals in tissues or bodily fluids. While this data provides regulatory and public health officials with information regarding human chemical exposure it cannot reveal how (inhalation, water, ingestion, etc) or where the exposure occurred.
Without context, biomontioring data can be misconstrued. The CDC (Centers for Disease Control) has stated: "Just because people have an environmental chemical in their blood or urine does not mean that the chemical causes disease. The toxicity of a chemical is related to its dose or concentration. Small amounts may be of no health consequence, whereas larger amounts may cause disease.”