DICOM PS3.3 2020a - Information Object Definitions

C.18 Content Macros (Current)
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## C.18 Content Macros

### C.18.1 Numeric Measurement Macro

Table C.18.1-1 specifies the Attributes that convey a NUM (numeric measurement) value.

### Note

The Measured Value Sequence (0040,A300) may be empty to convey the concept of a measurement whose value is unknown or missing, or a measurement or calculation failure.

Table C.18.1-1. Numeric Measurement Macro Attributes

Attribute Name | Tag | Type | Attribute Description
--- | --- | --- | ---
Measured Value Sequence | (0040,A300) | 2 | This is the value of the Content Item. Shall consist of a Sequence of Items conveying the measured value(s), which represent integers or real numbers and units of measurement. Zero or one Item shall be included in this Sequence.
>Numeric Value | (0040,A30A) | 1 | Numeric measurement value. Only a single value shall be present.
>Floating Point Value | (0040,A161) | 1C | The floating point representation of Numeric Value (0040,A30A). Only a single value shall be present. Required if Numeric Value (0040,A30A) has insufficient precision to represent the value as a string. May be present otherwise.
>Rational Numerator Value | (0040,A162) | 1C | The integer numerator of a rational representation of Numeric Value (0040,A30A). Encoded as a signed integer value. Only a single value shall be present. Required if Numeric Value (0040,A30A) has insufficient precision to represent a rational value as a string. May be present otherwise.
>Rational Denominator Value | (0040,A163) | 1C | The integer denominator of a rational representation of Numeric Value (0040,A30A). Encoded as a non-zero unsigned integer value. Only a single value shall be present. Required if Rational Numerator Value (0040,A162) is present.
>Measurement Units Code Sequence | (0040,08EA) | 1 | Units of measurement. Only a single Item shall be included in this Sequence.
>>Include Table 8.8-1 “Code Sequence Macro Attributes” | DCID 82 “Units of Measurement”.
Numeric Value Qualifier Code Sequence | (0040,A301) | 3 | Qualification of Numeric Value (0040,A30A) in Measured Value Sequence (0040,A300), or reason for absence of Measured Value Sequence (0040,A300) Item. Only a single Item is permitted in this Sequence.
>Include Table 8.8-1 “Code Sequence Macro Attributes” | DCID 42 “Numeric Value Qualifier”.

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DICOM PS3.3 2020a - Information Object Definitions