| 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 |
| identifier | 0..* | Identifier | Identifiers assigned to this order |
| instantiatesCanonical | 0..* | canonical | Instantiates FHIR protocol or definition |
| instantiatesUri | 0..* | uri | Instantiates external protocol or definition |
| basedOn | 0..* | Reference | What request fulfills |
| replaces | 0..* | Reference | What request replaces |
| requisition | 0..1 | Identifier | Composite Request ID |
| status | 1..1 | code | draft | active | on-hold | revoked | completed | entered-in-error | unknown |
| intent | 1..1 | code | proposal | plan | directive | order | original-order | reflex-order | filler-order | instance-order | option |
| category | 0..* | CodeableConcept | Classification of service |
| priority | 0..1 | code | routine | urgent | asap | stat |
| doNotPerform | 0..1 | boolean | True if service/procedure should not be performed |
| code | 0..1 | CodeableConcept | What is being requested/ordered |
| orderDetail | 0..* | CodeableConcept | Additional order information |
| quantity[x] | 0..1 | Quantity | Service amount |
| subject | 1..1 | Reference | Individual or Entity the service is ordered for |
| encounter | 0..1 | Reference | Encounter in which the request was created |
| occurrence[x] | 0..1 | dateTime | When service should occur |
| asNeeded[x] | 0..1 | boolean | Preconditions for service |
| authoredOn | 0..1 | dateTime | Date request signed |
| requester | 0..1 | Reference | Who/what is requesting service |
| performerType | 0..1 | CodeableConcept | Performer role |
| performer | 0..* | Reference | Requested performer |
| locationCode | 0..* | CodeableConcept | Requested location |
| locationReference | 0..* | Reference | Requested location |
| reasonCode | 0..* | CodeableConcept | Explanation/Justification for procedure or service |
| reasonReference | 0..* | Reference | Explanation/Justification for service or service |
| insurance | 0..* | Reference | Associated insurance coverage |
| supportingInfo | 0..* | Reference | Additional clinical information |
| specimen | 0..* | Reference | Procedure Samples |
| bodySite | 0..* | CodeableConcept | Location on Body |
| note | 0..* | Annotation | Comments |
| patientInstruction | 0..1 | string | Patient or consumer-oriented instructions |
| relevantHistory | 0..* | Reference | Request provenance |