Deep Vein Thrombosis (DVT)
What is Deep Vein Thrombosis (DVT)?
Deep vein thrombosis is a blood clot that forms in a vein deep inside your body. These clots most often develop in the legs, but they can also occur in the arms or pelvis. DVT happens when blood thickens and clumps together inside a vein instead of flowing smoothly.
Blood clots can partially or completely block blood flow through the vein. The clot may stay in place or break off and travel through your bloodstream. If a clot breaks free and reaches your lungs, it can cause a serious condition called pulmonary embolism. This is why understanding your clotting risk is important for prevention.
DVT affects about 900,000 people in the United States each year. Some people develop DVT because of inherited blood clotting disorders, while others face higher risk due to surgery, injury, or long periods without movement. Testing your blood for clotting factors can help you understand your personal risk.
Symptoms
- Swelling in one leg or arm, rarely both legs at once
- Pain or tenderness that often starts in the calf
- Warmth in the affected area
- Red or discolored skin on the leg or arm
- Veins that appear larger than normal or feel hard
- Skin that feels tight or heavy
- Leg cramps, especially at night
Many people with DVT have no symptoms at all, especially in the early stages. About half of people with DVT experience no noticeable signs. This is why understanding your blood clotting risk through testing is important even if you feel fine.
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Causes and risk factors
DVT occurs when something slows or changes the normal flow of blood through your veins. Sitting for long periods during travel or bed rest can cause blood to pool in your legs. Surgery and injury can damage blood vessels and trigger clotting. Certain inherited conditions affect proteins in your blood that control clotting, making some people more prone to forming clots than others.
Risk factors include being over 60 years old, smoking, obesity, pregnancy, taking birth control pills or hormone therapy, and having cancer or heart disease. Family history matters too. If close relatives have had blood clots, your risk increases. Long flights or car rides, especially those lasting more than 4 hours, can raise your risk temporarily.
How it's diagnosed
Doctors diagnose DVT using imaging tests like ultrasound, which shows blood flow through your veins. Blood tests play an important role in understanding your risk and checking for clotting disorders. These tests measure proteins and factors in your blood that control how it clots.
Rite Aid offers blood testing that checks key clotting factors including Antithrombin III Antigen, Protein C Activity, and fibrinogen levels. Low levels of certain proteins like Protein C and Antithrombin III can increase your risk of forming clots. High fibrinogen activity can lead to excessive clotting. Testing for Factor V Leiden Mutation and Prothrombin mutations can identify inherited conditions that raise DVT risk. Getting tested helps you and your doctor create a prevention plan based on your specific risk factors.
Treatment options
- Blood thinning medications like warfarin, heparin, or newer anticoagulants to prevent clot growth
- Compression stockings to reduce swelling and prevent complications
- Staying active and moving regularly to keep blood flowing
- Elevating your legs when sitting or lying down
- Drinking plenty of water to prevent dehydration
- Maintaining a healthy weight through nutrition and exercise
- Avoiding long periods of sitting, especially during travel
- Quitting smoking to improve blood vessel health
- Eating foods rich in omega-3 fatty acids and avoiding excess vitamin K if taking warfarin
Need testing for Deep Vein Thrombosis (DVT)? 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
A blood clot in your leg often causes swelling and pain that may feel like a cramp or charley horse. The affected area may feel warm to the touch and appear red or discolored. Some people describe a heavy or tight feeling in the leg. However, many people with DVT have no symptoms at all in the early stages.
A DVT can form within hours or develop over several days. The timeline varies based on factors like how long you have been immobile and your individual clotting risk. Long flights or hospital stays can trigger clot formation relatively quickly in people at higher risk. This is why prevention is so important during and after high-risk situations.
DVT requires medical treatment and will not safely resolve on its own. Without treatment, the clot can grow larger and potentially break off and travel to your lungs. Blood thinning medications help prevent the clot from growing and reduce the risk of serious complications. Always seek medical care if you suspect DVT.
Blood tests for DVT risk measure clotting factors and proteins in your blood. These include Protein C Activity, Antithrombin III Antigen, fibrinogen levels, and genetic tests for Factor V Leiden and Prothrombin mutations. Low levels of natural anticlotting proteins or high fibrinogen can indicate increased risk. Rite Aid offers these specialized clotting tests as add-ons to help assess your risk.
Yes, sitting for long periods without movement can increase your DVT risk. When you sit still, blood pools in your legs and flows more slowly. This can lead to clot formation, especially if you have other risk factors. Stand up and walk around for a few minutes every hour, flex your feet and ankles regularly, and stay hydrated throughout the day.
DVT can run in families due to inherited blood clotting disorders. Genetic mutations like Factor V Leiden and Prothrombin mutations are passed down through families and increase clotting risk. If you have close relatives who have had blood clots, your risk is higher. Genetic testing can identify these inherited conditions and help guide prevention strategies.
DVT is a serious condition that requires medical treatment. The main danger is that the clot can break free and travel to your lungs, causing a pulmonary embolism. This can be life-threatening. DVT can also damage valves in your veins, leading to long-term swelling and pain. With proper treatment and prevention, most people with DVT recover well.
Staying physically active is one of the best ways to prevent DVT. Regular movement keeps blood flowing smoothly through your veins. Maintain a healthy weight, quit smoking, and stay hydrated. During long travel, walk around every hour or flex your feet and ankles frequently. Wear loose, comfortable clothing and avoid crossing your legs for extended periods.
Yes, birth control pills that contain estrogen increase your risk of blood clots. The hormones in these medications can affect how your blood clots. Your risk is higher if you smoke, are over 35, or have inherited clotting disorders. Talk to your doctor about your clotting risk before starting hormonal birth control, especially if you have a family history of blood clots.
Treatment length varies from 3 months to lifelong depending on what caused your DVT. If your clot resulted from a temporary situation like surgery, you may take blood thinners for 3 to 6 months. If you have an inherited clotting disorder or recurrent clots, you may need lifelong treatment. Your doctor will determine the right duration based on your individual risk factors and test results.