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Sniffing out Alzheimer's: simple smell test could spot early brain changes

NCT ID NCT05881239

Diagnosis Sponsor: Massachusetts General Hospital Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
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
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 explores whether a simple, at-home smell test can help detect early signs of Alzheimer's and other memory disorders. Researchers will ask 250 adults with mild memory or behavior concerns, as well as healthy older adults, to take a 45-minute scratch-and-sniff test using a smartphone app. The goal is to develop a low-cost, noninvasive tool that could one day help doctors identify brain diseases earlier.

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.

Participants

About 250 people

The number the study aims to enrol. It can still change while the study runs.

Started

May 2023

Expected to finish

Dec 2027

An estimate. End dates often move.

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.

Who is studied

1. Subjective Cognitive Concerns (SCC), 2. Mild Cognitive Impairment, 3. Mild Behavioral Impairment, 4. Healthy Age-matched Controls.

Ages

18 to 100 years

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

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: * A clinical or research consensus diagnosis of the patient's condition or control status. * Individuals that are at least 18 years of age at the time of enrollment. * Individuals that are no older than 100 years of age at the time of enrollment. Exclusion Criteria: * Primary pulmonary disease such as severe emphysema or asthma not under good medical control. * Current sinusitis, common cold, upper respiratory infection, or nasal polyps. * Current or recent (past 6 months) alcohol or substance dependence. A prior history of alcohol or substance abuse will not be grounds for exclusion. * Pregnancy. * Severe cognitive dysfunction that would preclude completion of the olfactory testing. * An adverse reaction to fragrances (ie. they trigger a severe asthmatic attack or nausea).

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Conditions

The condition(s) this trial relates to.

Alzheimer disease Anosmia Cognitive Dysfunction Nerve Degeneration subjective cognitive decline

As listed by the trial registrant

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

Healthy aging Mild behavioral impairment Mild cognitive impairment Subjective cognitive concerns

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • Massachusetts General Hospital

    RECRUITING

    Boston, Massachusetts, 02129, United States

More trials for these conditions

Other studies related to the condition(s) this trial covers.