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Diagnostic reference level

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[[File:Glossary Icon-2.png|100px|frameless|right|link=ICRP Glossary]]
A diagnostic reference level is a form of investigation level used as a tool to aid in optimisation of protection in the medical exposure of patients for diagnostic and interventional procedures. It is used in medical imaging with ionising radiation to indicate whether in routine conditions the amount of radiation used for a specified procedure is unusually high or low for that procedure. For nuclear medicine the administered activity (amount of radioactive material) or preferably the administered activity per unit of body weight is used. Also see ‘DRL quantity’.
(from [[ICRP Publication 135]], 2017)
Dose levels in medical radiodiagnostic practices or in the case of radiopharmaceuticals levels of activity for typical examinations for groups of standard- sized patients or standard phantoms for broadly defined types of equipment. These levels are not expected to be exceeded for standard procedures when good and normal practice regarding diagnostic and technical performance is applied.
=== from [[ICRP Publication 127103]], 2014 === Used in medical imaging with ionising radiation to indicate whether in routine conditions the patient dose or administered activity (amount of radioactive material) from a specified procedure is unusually high or low for that procedure. === from 2007; [[ICRP Publication 103120]], 2007 2012; and [[ICRP Publication 120127]], 2012 2014 ===
Used in medical imaging with ionizing radiation to indicate whether, in routine conditions, the patient dose or administered activity (amount of radioactive material) from a specified procedure is unusually high or low for that procedure.
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