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Clinical Trials Change Monitor: Status & Updates

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Track changes to ClinicalTrials.gov studies with the official API: overall status and why stopped, phase, enrollment, primary completion date, locations added or removed, results posted, sponsors and arms. Monitor mode returns only what changed; recent-updates mode lists the latest updates.

Pricing

from $2.00 / 1,000 study returneds

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Developer

Offera Studio

Actor stats

Bookmarked

Total users

Monthly active users

3 days ago

Last modified

Categories

Automation

Developer tools

NCT ID

nctId

Optional

ClinicalTrials.gov identifier.

Type:string | null

Example:

NCT05567796

Title

title

Optional

Brief title.

Type:string | null

Sponsor class

sponsorClass

Optional

INDUSTRY, NIH, OTHER ...

Type:string | null

Phase

phase

Optional

Phases joined by "/": PHASE3, PHASE2/PHASE3. Null when not applicable.

Type:string | null

Example:

PHASE3

Overall status

status

Optional

RECRUITING, COMPLETED, TERMINATED ...

Type:string | null

Example:

ACTIVE_NOT_RECRUITING

Why stopped

whyStopped

Optional

The sponsor's reason for a terminated, withdrawn or suspended study.

Type:string | null

Study type

studyType

Optional

Type:string | null

Example:

INTERVENTIONAL

Enrollment

enrollmentCount

Optional

Type:number | null

Example:

3400

Enrollment type

enrollmentType

Optional

ACTUAL or ESTIMATED.

Type:string | null

Example:

ESTIMATED

Start date

startDate

Optional

YYYY-MM or YYYY-MM-DD, as registered.

Type:string | null

Primary completion date

primaryCompletionDate

Optional

Type:string | null

Primary completion date type

primaryCompletionDateType

Optional

ACTUAL or ESTIMATED.

Type:string | null

Completion date

completionDate

Optional

Type:string | null

Completion date type

completionDateType

Optional

Type:string | null

Last update posted

lastUpdatePostDate

Optional

YYYY-MM-DD.

Type:string | null

Example:

2026-09-30

Results posted

hasResults

Optional

Type:boolean

Results first posted

resultsFirstPostDate

Optional

Type:string | null

Conditions

conditions

Optional

Type:string[]

Interventions

interventions

Optional

TYPE: name.

Type:string[]

Collaborators

collaborators

Optional

Type:string[]

Locations

locationCount

Optional

Number of study sites listed.

Type:integer

Countries

countries

Optional

Type:string[]

ClinicalTrials.gov link

url

Optional

Type:string

Example:

https://clinicaltrials.gov/study/NCT05567796

Mode

mode

Optional

monitor or recent-updates.

Type:string | null

Options:

monitorrecent-updatesnull

Change status

changeStatus

Optional

Monitor: baseline (first snapshot), new (a new match since the baseline), changed or unchanged. Recent updates: recent-update.

Type:string

Options:

baselinenewchangedunchangedrecent-update

Summary

summary

Optional

One line about what changed, for monitor rows.

Type:string

Example:

Overall status RECRUITING → TERMINATED (why stopped: sponsor decision); 2 locations removed

Changed fields

changedFields

Optional

Type:string[]

Changes

changes

Optional

Field-level diff since the last run: overall status (with why stopped), phase, enrollment, primary and overall completion date, locations added or removed, results posted, sponsor, collaborators, arms and interventions.

Type:object[]

Previous snapshot

previousCheckedAt

Optional

When the snapshot that this row was compared with was saved.

Type:string | null

Retrieved at

retrievedAt

Optional

ISO 8601 time.

Type:string

Info code

error

Optional

invalid-input, no-results, rate-limited, api-error, bad-request, snapshot-too-large. Such rows are free.

Type:string | null

Message

errorMessage

Optional

Type:string | null

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