Thrombosis
What is Thrombosis?
Thrombosis is the formation of a blood clot inside a blood vessel. The clot blocks normal blood flow through your circulatory system. When blood cannot move freely, tissues and organs may not get the oxygen they need.
Blood clots can form in arteries or veins anywhere in your body. Arterial thrombosis affects vessels carrying oxygen-rich blood from your heart. Venous thrombosis affects vessels returning blood to your heart. Deep vein thrombosis, or DVT, happens when clots form in deep veins of the legs. Pulmonary embolism occurs when a clot travels to your lungs.
Your body normally forms clots to stop bleeding from injuries. Thrombosis happens when clots form when they should not. This condition can be life threatening if clots break free and travel to vital organs. Early detection through blood testing helps identify people at higher risk before dangerous clots develop.
Symptoms
- Swelling in one leg or arm
- Pain or tenderness in the affected limb
- Warmth over the swollen or painful area
- Red or discolored skin on the leg or arm
- Visible surface veins becoming larger
- Chest pain or difficulty breathing if a clot reaches the lungs
- Rapid heart rate
- Coughing up blood in severe cases
Some people have no symptoms when a clot first forms. Silent clots are especially dangerous because they can grow or break loose without warning. This is why blood testing for clotting risk is important even when you feel fine.
Concerned about Thrombosis? Check your levels.
Screen for 1,200+ health conditions
Causes and risk factors
Thrombosis happens when blood clots form abnormally inside vessels. Three main factors contribute to this problem. Slow blood flow from sitting too long or bed rest allows clots to form. Damage to blood vessel walls from injury, surgery, or inflammation triggers clotting. Changes in blood chemistry that make it clot too easily increase risk.
Risk factors include prolonged sitting during travel, recent surgery, pregnancy, birth control pills, and hormone therapy. Smoking damages blood vessels and increases clotting. Cancer and cancer treatments raise risk significantly. Genetic factors like high fibrinogen levels or elevated lipoprotein a make your blood more likely to clot. Being over age 60, having obesity, or a family history of blood clots all increase your chances of developing thrombosis.
How it's diagnosed
Doctors diagnose thrombosis through imaging tests and blood work. Ultrasound can show clots in leg veins. CT scans or special lung scans detect clots in the chest. Blood tests measure proteins involved in clotting and identify people at higher risk.
Rite Aid offers add-on blood tests that measure key clotting markers. The Clauss test measures how quickly your blood forms fibrin, the protein that creates clots. Fibrinogen Antigen levels show how much clotting protein is in your blood. High levels increase thrombosis risk. Lipoprotein a testing identifies genetic factors that make clots more likely. These biomarkers help you and your doctor understand your clotting risk before a dangerous event occurs. Testing through Quest Diagnostics locations makes monitoring easy and convenient.
Treatment options
- Blood thinners or anticoagulant medications to prevent new clots and stop existing ones from growing
- Thrombolytic drugs that dissolve clots in emergency situations
- Compression stockings to improve blood flow in the legs
- Regular movement and leg exercises, especially during long periods of sitting
- Staying well hydrated to keep blood flowing smoothly
- Maintaining a healthy weight through nutrition and activity
- Quitting smoking to reduce blood vessel damage
- Eating foods rich in omega-3 fatty acids and low in processed ingredients
- Working with your doctor to manage conditions like high cholesterol or diabetes
Need testing for Thrombosis? Add it to your panel.
- Simple blood draw at your nearest lab
- Results in days, not weeks
- Share results with your doctor
Frequently asked questions
Arterial thrombosis affects arteries that carry oxygen-rich blood from your heart to your body. Venous thrombosis affects veins that return blood to your heart. Arterial clots often cause heart attacks and strokes, while venous clots typically occur in leg veins and can travel to the lungs.
Small clots sometimes dissolve naturally as your body breaks them down. However, you should never wait to see if a clot goes away on its own. Untreated thrombosis can lead to serious complications including permanent vessel damage, pulmonary embolism, or death. Always seek medical care if you suspect a blood clot.
Blood clots can form within hours under the right conditions. Long flights or bed rest can trigger clot formation in as little as 4 to 6 hours. However, chronic conditions that increase clotting risk develop over months or years. Regular blood testing helps identify elevated risk before clots actually form.
Several blood tests measure clotting factors and identify high-risk individuals. The Clauss test measures how fast fibrin clots form. Fibrinogen Antigen shows the amount of clotting protein in your blood. Lipoprotein a testing reveals genetic factors that increase clot risk. These tests are available as add-ons through Rite Aid at Quest Diagnostics locations.
Yes, genetic factors can increase your thrombosis risk significantly. Conditions like Factor V Leiden mutation or high lipoprotein a run in families. If close relatives have had blood clots, your risk is 2 to 3 times higher than average. Blood testing can identify inherited clotting disorders so you and your doctor can take preventive steps.
Stay active and avoid sitting for more than 2 hours without moving. Drink plenty of water throughout the day. Maintain a healthy weight through balanced nutrition and regular exercise. Quit smoking, as tobacco damages blood vessels and increases clotting risk.
Deep vein thrombosis in the leg can be very serious. The clot can cause permanent damage to leg veins, leading to chronic pain and swelling. More dangerously, the clot can break free and travel to your lungs, causing pulmonary embolism. This blocks oxygen and can be fatal without immediate treatment.
Yes, nutrition plays an important role in clotting risk. Foods high in omega-3 fatty acids like fish and flaxseed help keep blood flowing smoothly. Staying hydrated prevents blood from becoming too thick. Limit processed foods high in saturated fats, as these can increase fibrinogen and other clotting factors.
Testing frequency depends on your individual risk factors. If you have a family history of clots, previous thrombosis, or take birth control pills, annual testing helps track your levels. People on blood thinners may need testing every few months. Discuss your specific situation with your doctor to create a monitoring schedule.
Seek medical care immediately if you experience leg swelling, pain, chest pain, or difficulty breathing. Do not wait to see if symptoms improve on their own. Call 911 if you have chest pain or cannot breathe normally. Early treatment with blood thinners can prevent serious complications and save your life.