| id | 0..1 | string | Logical id of this artifact |
| meta | 0..1 | Meta | Metadata about the resource |
| implicitRules | 0..1 | uri | A set of rules under which this content was created |
| language | 0..1 | code | Language of the resource content |
| text | 0..1 | Narrative | Text summary of the resource, for human interpretation |
| contained | 0..* | Resource | Contained, inline Resources |
| extension | 0..* | Extension | Additional content defined by implementations |
| modifierExtension | 0..* | Extension | Extensions that cannot be ignored |
| category | 0..* | CodeableConcept | Category of observation |
| code | 1..1 | CodeableConcept | Type of observation (code / type) |
| identifier | 0..* | Identifier | Business identifier for this ObservationDefinition instance |
| permittedDataType | 0..* | code | Quantity | CodeableConcept | string | boolean | integer | Range | Ratio | SampledData | time | dateTime | Period |
| multipleResultsAllowed | 0..1 | boolean | Multiple results allowed |
| method | 0..1 | CodeableConcept | Method used to produce the observation |
| preferredReportName | 0..1 | string | Preferred report name |
| quantitativeDetails | 0..1 | BackboneElement | Characteristics of quantitative results |
| qualifiedInterval | 0..* | BackboneElement | Qualified range for continuous and ordinal observation results |
| validCodedValueSet | 0..1 | Reference | Value set of valid coded values for the observations conforming to this ObservationDefinition |
| normalCodedValueSet | 0..1 | Reference | Value set of normal coded values for the observations conforming to this ObservationDefinition |
| abnormalCodedValueSet | 0..1 | Reference | Value set of abnormal coded values for the observations conforming to this ObservationDefinition |
| criticalCodedValueSet | 0..1 | Reference | Value set of critical coded values for the observations conforming to this ObservationDefinition |