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Digital nudge letters boost kidney care in massive danish trial

NCT ID NCT06300086

Knowledge-focused Sponsor: Tor Biering-Sørensen Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed This study
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study tested whether sending digital letters to patients with chronic kidney disease and their family doctors could increase the use of recommended medications. Over 28,000 adults in Denmark took part. The goal was to see if simple reminders through the official government email system could improve treatment rates.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

28,388 people

The number who actually took part.

Started

Aug 2024

Finished

Feb 2025

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 years and older

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion criteria 1. Age +18 years 2. Diagnosis of CKD defined as at least one hospital encounter with the following ICD-10 codes in the primary diagnostic positions within ≤ 5 years: N18- N19, I12, E102, E112, E132, E142. Exclusion criteria For patient-level intervention comparisons: 1\) Exemption from the official, mandatory Danish electronic mailbox system. For general practice-level intervention comparisons: 1. Individuals on a patient list of general practice clinics run by Danish administrative Regions. 2. Individuals not on a patient list of a general practice.

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Conditions

The condition(s) this trial relates to.

Behavior chronic kidney disease chronic renal failure syndrome

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Behavior and behavior mechanisms Chronic kidney diseases

Contacts and locations

Locations

  • Center for Translational Cardiology and Pragmatic Randomized Trials, Department of Cardiology, Copenhagen University Hospital - Herlev and Gentofte

    Hellerup, Capital Region, 2900, Denmark

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