# Advanced Search
Snowray provides an advanced search option for SNOMED CT, which can be invoked by pressing the 
advanced filter icon in the search bar. This enables users to specify additional criteria to restrict their searches.
| **Field** | **Description** |
| --------------------- | -------------------------------------------------------------- |
| **Status** | Filter for active or inactive concepts |
| **Module** | Return concepts that are associated with the selected module |
| **Namespace** | Filter for concepts within the selected namespace |
| **Ancestor** | Return all child concepts of the selected concept |
| **Active member of** | Filter for concepts that are present in the selected resource |
| **Definition status** | Return either *Defined* or *Primitive* concepts only |
| **Description type** | Return *Fully Specified Name*, *Synonym*, or *Definition* only |
| **Effective time** | Search concepts by their release date |
The filters above are mostly dropdowns, while the [ECL](https://confluence.ihtsdotools.org/display/DOCECL) filter requires typing in a valid query. A content assist, which can be activated by pressing `Ctrl` + `Space` , helps users to construct ECL queries easily.
Once all the required filters are specified, pressing will update the tree only with the matching results according to the filters.
{% hint style="info" %}
Active members of a resource will only be detected correctly after the resource is synchronized, i.e. it is either released or exported to RF2.
{% endhint %}
---
# Agent Instructions: 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:
```
GET https://docs.b2ihealthcare.com/snowray/v2.7-1/reference/resources/codesystems/terminology-standards/snomed-ct/search.md?ask=
```
The question should be specific, self-contained, and written in natural language.
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.