# Cohort Operations tool (CO)

### With the Cohort Operations (CO) tool, you can:

* [Upload cohorts for further operations](/working-in-the-sandbox/which-tools-are-available/cohort-operations-tool-co/upload-cohorts-to-co.md) from:
  * [Atlas](/working-in-the-sandbox/which-tools-are-available/atlas.md)
  * [Genotype Browser](/working-in-the-sandbox/which-tools-are-available/genotype-browser.md)
  * text files (with FinnGen IDs and columns for `COHORT_SOURCE` and `COHORT_NAME`)
  * Endpoints
* [Combine cohorts](/working-in-the-sandbox/which-tools-are-available/cohort-operations-tool-co/combine-cohorts-with-co.md)
* [Operate on Atlas cohorts (data with entries and exit events)](/working-in-the-sandbox/which-tools-are-available/cohort-operations-tool-co/modifying-atlas-cohort-with-co.md)
* [Lookup and visualize code and endpoint enrichments in cohorts (CodeWAS)](/working-in-the-sandbox/which-tools-are-available/cohort-operations-tool-co/explore-code-and-endpoint-enrichments-with-co.md)
* [Lookup and visualize endpoint overlaps](/working-in-the-sandbox/which-tools-are-available/cohort-operations-tool-co/explore-endpoint-overlaps-with-co.md)
* [Examine endpoint overlaps with your control and cases cohorts](/working-in-the-sandbox/which-tools-are-available/cohort-operations-tool-co/understanding-phenotypic-overlaps-using-co.md)
* [Launch custom GWAS](/working-in-the-sandbox/which-tools-are-available/cohort-operations-tool-co/launch-custom-gwas-with-co.md)
* [Easily export FinnGen IDs](/working-in-the-sandbox/which-tools-are-available/cohort-operations-tool-co/export-finngen-ids-using-co.md) for cohorts
  * built with Atlas
  * generated from FinnGen endpoints
  * resulting from other operations available in the tool
  * [Transfer cohorts to TVT](/working-in-the-sandbox/which-tools-are-available/cohort-operations-tool-co/export-finngen-ids-using-co.md)

Check an [Example workflow for survival time/endpoint analysis](/working-in-the-sandbox/general-workflows-for-the-most-common-analyses.md) on how to use CO efficiently with other tools. It is important to check whether your cohorts are up to standard before continuing to GWAS.

See a tutorial video about CO on [FinnGen data users meeting 25th Jan 2022](https://www.finngen.fi/en/members/recordings/finngen-data-users-meeting-25th-jan-2022) at 16min35sec and [FinnGen data users' meeting 28th June 2022](https://www.finngen.fi/en/members/recordings/finngen-data-users-meeting-28th-june-2022) at 28min55sec.

See also a [presentation of New FinGen tools and their application to example diseases from User's meeting 28th March 2023 recording ](https://www.finngen.fi/en/members/recordings/finngen-data-users-meeting-28th-march-2023)(at 25min 23sec) including usage of Cohort Operations tool.


---

# 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.finngen.fi/working-in-the-sandbox/which-tools-are-available/cohort-operations-tool-co.md?ask=<question>
```

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.