> ## 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.

# Arm type

The category of treatment group that describes what participants receive - such as the experimental treatment, standard treatment, placebo, sham procedure, or no treatment.

## Related terms

<CardGroup cols={3}>
  <Card title="Experimental arm" href="experimental_arm" />

  <Card title="Active comparator arm" href="active_comparator_arm" />

  <Card title="Placebo comparator arm" href="placebo_comparator_arm" />

  <Card title="Sham comparator arm" href="sham_comparator_arm" />

  <Card title="No intervention arm" href="no_intervention_arm" />
</CardGroup>

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