# Recommended Search Parameters - PACIO Transitions of Care Implementation Guide v1.0.0

* [**Table of Contents**](toc.md)
* **Recommended Search Parameters**

## Recommended Search Parameters

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| *Page standards status:*[Informative](http://hl7.org/fhir/R4/versions.html#std-process) |

This section defines additional requirements and guidance relevant to this guide as a whole. The conformance verbs - `SHALL`, `SHOULD`, `MAY` - used in this guide are defined in [FHIR Conformance Rules](http://hl7.org/fhir/R4/conformance-rules.html).

### Bundle

| | | | | |
| :--- | :--- | :--- | :--- | :--- |
|  | [token](http://hl7.org/fhir/R4/search.html#token) | **SHOULD** | Search by FHIR resource ID | `GET [base]/Bundle?_id=[id]` |
| [composition](http://hl7.org/fhir/R4/bundle.html#search) | [reference](http://hl7.org/fhir/R4/search.html#reference) | **SHOULD** | Search by reference to a composition | `GET [base]/Bundle?composition=[reference]` |
| [identifier](http://hl7.org/fhir/R4/bundle.html#search) | [token](http://hl7.org/fhir/R4/search.html#token) | **SHOULD** | Search by business identifier | `GET [base]/Bundle?identifier=[token]` |
| [timestamp](http://hl7.org/fhir/R4/bundle.html#search) | [date](http://hl7.org/fhir/R4/search.html#date) | **SHOULD** | Search by a date in time | `GET [base]/Bundle?timestamp=[date]` |
| [type](http://hl7.org/fhir/R4/bundle.html#search) | [token](http://hl7.org/fhir/R4/search.html#token) | **SHOULD** | Search by type code | `GET [base]/Bundle?type=[system]|[code]` |

 

### Patient

 We strongly recommend using the $match operation in performing a system-to-system query to ensure that the right patient is selected. The Patient.search parameters below may be generally used for subsequent queries once the patient is selected. Search parameter requirements for Patient under this IG match those for [US Core Patient search requirements](https://hl7.org/fhir/us/core/STU4/StructureDefinition-us-core-patient.html#mandatory-search-parameters) 

 

