Post-COVID Blood Clotting Risks: What You Need to Know

Gloved hand holding a blood test tube labeled

The COVID-19 pandemic has left a lasting impact on global health, and even as the immediate crisis has eased, its long-term effects are becoming clearer. One concerning trend is the increase in blood-clotting-related complications, such as strokes and heart attacks, observed in individuals who have recovered from COVID-19 or received COVID-19 vaccines. Understanding these risks and taking proactive steps to monitor and protect vascular health is essential for everyone, especially those with pre-existing conditions or lingering symptoms.

-Dr. John Salerno

The Rising Threat of Blood Clotting Post-COVID: Key Insights and Preventive Measures

Why Blood Clotting Risks Are Rising

 

The rise in blood clotting incidents post-COVID is linked to several factors:

 

  • COVID-19 and Inflammation: The virus that causes COVID-19, SARS-CoV-2, triggers a strong inflammatory response in the body. This can disrupt normal blood clotting processes, increasing the risk of abnormal clot formation.

 

  • Vaccine-Related Monitoring: While vaccines have been critical in controlling the pandemic, some individuals have reported elevated markers of clotting activity, such as D-dimer levels, after vaccination. These cases are rare but highlight the importance of monitoring, particularly for those with underlying risk factors.

 

These clots can often go unnoticed until they cause serious conditions like deep vein thrombosis (DVT), pulmonary embolisms, strokes, or heart attacks.

Diagram of legs with varicose veins, and illustration of deep vein thrombosis showing blood clots in veins.

The Role of D-dimer Testing

 

D-dimer is a protein fragment released when blood clots dissolve. Testing for D-dimer levels can help identify clotting activity in the body. Normally, D-dimer levels are low, but elevated levels may indicate active clot formation and warrant further investigation.

 

This simple blood test is non-invasive and can serve as an early warning system for clotting risks. While a high D-dimer result doesn't confirm the presence of a clot, it signals the need for additional diagnostic steps, such as imaging or further blood tests.

 

Who Should Consider Testing?

 

Certain groups may benefit from D-dimer testing to assess their risk of blood clots:

 

  • Individuals recovering from COVID-19
  • People who have received COVID-19 vaccines and experience symptoms like swelling, headaches, or shortness of breath
  • Those with a history of clotting disorders or cardiovascular issues
  • Older adults or individuals with immune disorders or blood diseases

 

Proactive testing can help identify risks early and prevent serious complications.

 

Additional Diagnostic Tools

 

If D-dimer levels are elevated, further diagnostic measures can provide a clearer picture of clotting risks:

 

  • Ultrasound Imaging: This painless procedure can detect clots in veins or arteries, such as DVT in the legs or larger clots in the chest.


  • Complementary Blood Tests: Additional tests can assess overall blood health, inflammation markers, and clotting tendencies, helping to guide personalized care.

 

Preventing Blood Clots

 

Prevention is key to reducing the risk of blood clots. While medical interventions may be necessary for some, simple lifestyle changes can also make a significant difference:

 

  • Stay Active: Regular physical activity promotes healthy blood circulation.
  • Hydrate: Proper hydration helps prevent blood from thickening.
  • Adopt an Anti-inflammatory Diet: Foods rich in omega-3 fatty acids, like salmon and flaxseeds, support cardiovascular health and reduce inflammation.
Bottle of Nattokinase Factor supplement, white label, teal and gold accents, 60 capsules to prevent blood clotting

Nattokinase Factor

Nattokinase Factor is a dietary supplement formulated by Dr. John Salerno to support circulatory health. It features nattokinase, a naturally occurring enzyme extracted from fermented soybeans, which has been studied for its role in promoting healthy blood flow and vascular function. Nattokinase Factor is intended for individuals seeking to support cardiovascular wellness as part of a healthy lifestyle.


Nattokinase is an enzyme with fibrinolytic properties, meaning it assists the body in breaking down fibrin, a protein involved in blood clotting. This activity may help maintain healthy circulation. Unlike some enzymes that require activation, nattokinase is active in its natural form, allowing it to function when taken orally on an empty stomach.


Learn more.

A Shared Responsibility

 

The post-COVID era presents unique health challenges, but awareness and early action can help mitigate risks. Whether you've had COVID-19, received a vaccine, or are simply concerned about your vascular health, staying informed and proactive is essential.


By understanding the risks, utilizing tools like D-dimer testing, and adopting healthy habits, we can all take steps to protect our long-term well-being in this evolving health landscape.


Summary


The COVID-19 pandemic has led to increased blood-clotting-related complications, such as strokes and heart attacks, among individuals who have recovered from the virus or received vaccinations. This rise is attributed to the inflammatory response triggered by the virus and, in some cases, the effects of the vaccines, which have led to elevated clotting markers like D-dimer.


D-dimer testing can help identify individuals at risk by detecting clotting activity, although high levels do not confirm the presence of clots. Certain groups, including those recovering from COVID-19, vaccinated individuals with concerning symptoms, and people with a history of clotting disorders, may benefit from this testing.


Further diagnostic procedures like ultrasound imaging and additional blood tests can provide a clearer picture of clotting risks. To prevent blood clots, individuals are encouraged to stay active, maintain hydration, and adopt an anti-inflammatory diet. Overall, awareness and proactive health measures are essential in navigating post-COVID health challenges.

Woman with gray hair smiling in mirror, hands on her face; light pink top; neutral background.
By Dr. John Salerno August 20, 2025
ging is inevitable, but how we age is essentially within our control. Research has shown that simple lifestyle tweaks can slow the aging process, enhance your quality of life, and help you remain vibrant and energetic for years to come.
Hand holding microplastics, with icons of plastic items: cup, bottle, bag, and container.
By Dr. John Salerno August 20, 2025
Microplastics are tiny plastic particles found throughout our environment, including in the food we eat, the water we drink, and the air we breathe. Increasing research raises concerns about the potential health effects of frequent microplastic exposure.
A person in a blue glove is holding a bottle of glutathione aturesAtioxdantPowerhuse
By Dr. John Salerno July 28, 2025
Glutathione Nature's Antioxidant Powerhouse. The Vital Role of Glutathione A Powerful Antioxidant in Maintaining Health and Combating Disease
A woman is sitting at a desk with a laptop and papers with severe fatigue reading How to Remove Heav
By Dr. John Salerno July 13, 2025
How to Remove Heavy Metals with Chelation Therapy. Chelation Therapy Tips: The Key to Heavy Metal Detoxification and Health Restoration
Tick with the Head under the skin. Lyme Disease Survival Tips
By Dr. John Salerno June 21, 2025
Learn Lyme Disease Survival Tips from Dr. John Salerno of Salerno Wellness
A woman is blowing her nose into a napkin what You Dont Know About Allergy Season.
By Dr. John Salerno June 21, 2025
In this blog, I want to explain how understanding the immune system can empower you to manage allergies more effectively and embrace a healthier life.