COVID-19 blood clot danger revealed in massive patient registry

NCT ID NCT04535128

Completed Knowledge-focused Sponsor: Brigham and Women's Hospital Source: ClinicalTrials.gov ↗

First seen Jun 26, 2026 · Last updated Jun 26, 2026

Summary

This completed study looked at 11,000 COVID-19 patients to understand how often they develop dangerous blood clots in arteries or veins. Researchers tracked clot rates, risk factors, and outcomes over 30 and 90 days. The goal was to learn more about these complications to improve prevention and treatment.

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 successful, this study could help doctors better predict and prevent blood clots in COVID-19 patients, potentially saving lives.
What could go wrong: This is an observational study, not a treatment trial, so it cannot prove what works. Results may vary across different hospitals and patient groups.

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

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Conditions

The condition(s) this trial relates to.

COVID-19 Embolism and Thrombosis myocardial infarction pulmonary embolism stroke disorder Thromboembolism thrombotic disease venous thromboembolism

As listed by the trial registrant

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

COVID19 DVT MYOCARDIAL INFARCTION PULMONARY EMBOLISM STROKE THROMBOSIS EMBOLISM

Contacts and locations

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Locations

Brigham and Women's Hospital

Boston, Massachusetts, 02115, United States

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