> For the complete documentation index, see [llms.txt](https://docs.b2ihealthcare.com/snow-owl-authoring-platform/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.b2ihealthcare.com/snow-owl-authoring-platform/browsing-and-searching/searching/advanced-search/search-dialog/snomed-ct-concept-search.md).

# SNOMED CT Concept Search

Use the drop-down boxes to restrict the search to the concept status (active, inactive), description type (e.g. Synonym), a particular top-level hierarchy (e.g. Clinical finding), the module, the namespace, or the concept definition status. The search is not case-sensitive.

<figure><img src="/files/tfT5Zlkf4Tr6Aye6fP3u" alt=""><figcaption><p>SNOMED CT Concept Advanced Search</p></figcaption></figure>

You can specify an Effective time range or tick the **`Unpublished`** checkbox to look for unpublished content.

More advanced users can make use of query syntax:

| Command | Description                                                                                                     |
| ------- | --------------------------------------------------------------------------------------------------------------- |
| **?**   | substitutes a single character. E.g. the query `endoscop?` would match both `Endoscopy` and `Endoscope`         |
| **\***  | substitutes any number of characters. E.g. the query `pos*tive` would match both `positive` and `postoperative` |
| **\~**  | fuzzy search to find similar terms. E.g. the query `jandic` would match the correct term `Jaundice`             |
| **OR**  | `medication OR change` returns terms that contain either `medication` or `change`                               |
| **AND** | `medication AND change` returns terms that contain both `medication` and `change`                               |
| **NOT** | `blood NOT systolic` returns terms that contain `blood` but not `systolic`                                      |

Wildcards can be combined within the query expression. The importance of certain query terms can also be boosted: `* ^: medication OR change^5` would rank concepts that contain the word `change` higher than the ones that contain the word `medication`.

The *Search ECL expression* can be used to execute ECL-based semantic searches.

<figure><img src="/files/BI2gQgDVUGE0xTeuzbuA" alt=""><figcaption><p>ECL Query Advanced Search</p></figcaption></figure>

The *Search by Templates* tab can be used to execute a query based on the concepts created with a SNOMED CT Template.

<figure><img src="/files/8E3jDnJxDBjP1Zy7MxGS" alt=""><figcaption><p>Template Advanced Search</p></figcaption></figure>

{% hint style="warning" %}
This search will only pick those concepts that are created with a SNOMED CT Template.
{% endhint %}


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.b2ihealthcare.com/snow-owl-authoring-platform/browsing-and-searching/searching/advanced-search/search-dialog/snomed-ct-concept-search.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.