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Therapeutic drugTherapeutic drug monitoring is based upon the collaboration between a health care provider (clinician, pharmacist, nurse) responsible for making quantitative and qualitative decisions about drug treatment and the clinical labora­tory providing analytical services for the measurement of drug concentrations. The in­formation provided by a drug concentration measurement is generally greater than for other substances measured by the laboratory.

This is because, unlike say sodium or glucose, the in­take of a drug is quite well known and the pro­cesses of distribution and elimination are usu­ally very simple and not under the control of a multitude of homeostatic controlling reflexes.