List Field Sizes
Sizes of list/array fields. To search studies by a list field size, use `AREA[FieldName: size]` search operator. For example, [AREA\[Phase: size\] 2](https://clinicaltrials.gov/search?term=AREA%5BPhase:size%5D%202) query finds studies with 2 phases.
100+calls
N/Alatency
Updated: Oct 27, 2026, 12:40 AM
Continue setup in your AI
Only public catalog IDs and a safe return path are handed to the Plugins page. This does not run the tool or confirm current availability, authorization, price, limits, or upstream status; those conditions are checked again before execution.
- Selected tool
- clinicaltrials_gov.stats.field.sizes.retrieve.v1.a75eed1b
- Provider scope
- ClinicalTrials.gov
- Catalog updated
- 2026-10-27T00:40:01.989419+00:00
- Business task
- Pending verification
Continue setupYou can return to this tool page if the selection is incomplete or expires.
Run on this page: Execute is the in-site test path. Continue setup is for adding the public selection to an external AI; the two paths are tracked and validated separately.
Discover -> Inspect -> Call
Call setup
Tool ID
clinicaltrials_gov.stats.field.sizes.retrieve.v1.a75eed1bJSON
Before this Call
1 credit / call
The final charge is settled from actual provider usage and will appear in Usage.