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Could vitamin d levels predict COVID-19 severity? new study investigates

NCT ID NCT04394390

Knowledge-focused Sponsor: Bursa City Hospital 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 26, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This completed study looked at whether vitamin D levels in the blood are linked to how severe COVID-19 gets. Researchers measured vitamin D in 1,100 COVID-19 patients in Turkey. The goal was to see if current vitamin D thresholds reflect real clinical risk. This is an observational study, so it can't prove that vitamin D directly affects outcomes, but it may guide future research.

What this could mean

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

Active substance
vitamin D
What this could lead to
If a clear link is found, it could point toward vitamin D levels as a factor in COVID-19 severity, potentially influencing future prevention or treatment strategies.
What could go wrong
This is an observational study, not a treatment trial. It cannot prove cause and effect, and results may not apply to other populations or settings.

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

1,100 people

The number who actually took part.

Started

May 2020

Finished

Aug 2025

Lead sponsor

A government agency

The lead sponsor is a government body.

Who can take part

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

Who is studied

1100 confirmed COVİD-19 patients (PCR)

Ages

20 to 80 years

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.

To find out vitamin D levels and it's relation with the disease severity serum 25-hydroxy-vitamin D levels, 1100 confirmed Covid-19 patients with available laboratory findings were included. Exlucion Criterias: Using immunsuppresan medical treatment. Using vitamin D or replacement history of vitamin D in last 3 months. Patients with malnutrition, immun deficiency, chronic infections, chronic other diseases such as rheumatoid arthritis, ankylosing spondilitis, lupus, hemplegia, paraplegia etc.

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Conditions

The condition(s) this trial relates to.

COVID-19 Infections vitamin D deficiency

As listed by the trial registrant

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

COVID Vitamin D deficiency

Contacts and locations

Locations

  • Bursa City Hospital

    Bursa, Dogankoy, Turkey (Türkiye)

More trials for these conditions

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