> ## Documentation Index
> Fetch the complete documentation index at: https://glossary.micahealth.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Study type

A classification of clinical research methodologies, including interventional studies (clinical trials), observational studies (such as patient registries), and expanded access protocols.

[*Source*](https://clinicaltrials.gov/study-basics/glossary)