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Could vitamin d play a role in sleep apnea severity?

NCT ID NCT07788391

Knowledge-focused Sponsor: Hisar Intercontinental Hospital Source: ClinicalTrials.gov ↗

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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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Aug 26, 2026 · Last updated Aug 27, 2026 · Updated 1 time

Summary

This study looks at whether vitamin D levels differ among adults with and without obstructive sleep apnea (OSA). Researchers will compare blood vitamin D measurements in four groups: healthy controls, simple snorers, OSA patients without other health conditions, and OSA patients with other conditions. Using existing medical records, they will also examine if vitamin D status relates to the severity of sleep apnea. The goal is to better understand any connection between vitamin D and this common sleep disorder.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

What this could lead to
If a link is found, it could point toward vitamin D as a factor in sleep apnea severity, possibly guiding future prevention or treatment strategies.
What could go wrong
This is an observational study using existing records, so it cannot prove cause and effect. Results may be influenced by other health factors and may not apply to everyone.

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

269 people

The number who actually took part.

Started

Jan 2024

Finished

Apr 2026

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

The study population consisted of adults evaluated at Hisar Intercontinental Hospital between 2024 and 2026. Participants included a healthy control group and adults who underwent overnight polysomnography because of symptoms suggestive of sleep-disordered breathing. PSG-evaluated participants were classified as simple snoring/non-OSA (AHI \<5 events/hour), OSA without comorbidities, or OSA with comorbidities. The final study population included 269 participants: 81 healthy controls, 49 non-OSA participants, 50 patients with non-comorbid OSA, and 89 patients with comorbid OSA.

Ages

18 years and older

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: Adults aged 18 years or older. Participants with available serum 25-hydroxyvitamin D \[25(OH)D\] measurements. For PSG-evaluated groups, availability of overnight polysomnography data allowing classification according to the apnea-hypopnea index (AHI). Participants meeting the predefined criteria for one of the study groups: healthy control, simple snoring/non-OSA, OSA without comorbidities, or OSA with comorbidities. Exclusion Criteria: Missing or insufficient data required for study-group classification. Missing serum 25(OH)D measurements. Incomplete polysomnographic data preventing determination of OSA status or severity in PSG-evaluated participants.

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Conditions

The condition(s) this trial relates to.

obstructive sleep apnea syndrome vitamin D deficiency

As listed by the trial registrant

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

Obstructive sleep apnea Vitamin D deficiency

Contacts and locations

Locations

  • Hisar Intercontinental Hospital

    Istanbul, Istanbul, 34768, Turkey (Türkiye)

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