When multiple observations of the same type exist, one of these may be the selected value. Typically, this value is the average of the others, or it may be the last entered, or user chosen. TID 310 “Measurement Properties” provides a content item with concept name of (121404, DCM, "Selection Status") and a value set specified by DCID 224 “Selection Method”.

There are multiple ways that a measurement may originate. The measurement value may result as an output of an image interactive, system tool. Alternatively, the user may directly enter the value, or the system may create a value automatically as the mean of multiple measurement instances. TID 300 “Measurement” provides that a concept modifier of the numeric content item specify the derivation of the measurement. The concept name of the modifier is (121401, DCM, "Derivation"). CID 3627 “Measurement Type” provides concepts of appropriate measurement modifiers. Figure I.7-2 illustrates such a case.