# Vitamin D Levels in SARS-CoV-2: Do Current Adequacy Thresholds Reflect Clinical Risk? Insights From a Large Turkish Cohort

> **NCT04394390** · — · COMPLETED · sponsor: **Bursa City Hospital** · enrollment: 1100 (actual)

## Conditions studied

- COVID
- Vitamin D Deficiency

## Interventions

- **DIETARY_SUPPLEMENT:** vitamin d

## Key facts

- **NCT ID:** NCT04394390
- **Lead sponsor:** Bursa City Hospital
- **Sponsor class:** OTHER_GOV
- **Phase:** —
- **Study type:** OBSERVATIONAL
- **Status:** COMPLETED
- **Start date:** 2020-05-01
- **Primary completion:** 2021-05-15
- **Final completion:** 2025-08-30
- **Target enrollment:** 1100 (ACTUAL)
- **Last updated:** 2026-02-05


## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT04394390

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT04394390, "Vitamin D Levels in SARS-CoV-2: Do Current Adequacy Thresholds Reflect Clinical Risk? Insights From a Large Turkish Cohort". Retrieved via AI Analytics 2026-07-20 from https://api.ai-analytics.org/clinical/NCT04394390. Licensed CC0.

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