Around 60,000 people in the UK die from venous thromboembolism each year, including deaths from pulmonary embolism caused by DVT-originated clots. Deep vein thrombosis, the clot itself, is survivable and treatable. The complications that follow it are where the real long-term burden lies. Post-thrombotic syndrome, which develops in up to half of all DVT survivors, produces chronic leg pain, persistent swelling, and, in severe cases, venous leg ulcers that significantly reduce quality of life for years after the initial clot has resolved.

Compression socks sit at the centre of both DVT prevention and post-DVT management. In the prevention context, they reduce the venous stasis that allows clots to form during periods of immobility. In the post-DVT context, they are the primary tool for managing post-thrombotic syndrome and reducing the risk of recurrence. The complication is that compression socks are not appropriate in all situations involving DVT, and using the wrong garment, at the wrong pressure, at the wrong time, can cause harm rather than help. Understanding the distinction between those situations is the most important thing this article will give you.

By the end, you will know how compression socks prevent DVT, when and how they are used after a clot has been diagnosed, which compression level applies to which situation, how to measure and fit correctly, and when compression is contraindicated, and a doctor's assessment is needed before any garment is used. This is not a simple purchase decision. It is a clinical one, and this article treats it accordingly.

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What Is Deep Vein Thrombosis and Why Does It Develop?

Deep vein thrombosis is the formation of a blood clot inside one of the deep veins of the body, most commonly in the calf, thigh, or pelvis. Unlike the superficial veins that sit just below the skin surface, the deep veins carry the majority of blood returning from the lower limbs to the heart. When a clot forms in these vessels, it partially or completely blocks that return, causing the swelling, pain, warmth, and redness that are the classic symptoms of DVT. The immediate risk is that part of the clot breaks away, travels through the venous system, and lodges in the pulmonary arteries, causing a pulmonary embolism that can be fatal.

The conditions that produce DVT are summarised in what clinicians call Virchow's triad: venous stasis, or slowed blood flow; endothelial injury, or damage to the vein wall; and hypercoagulability, or an increased tendency for blood to clot. In practice, most DVT cases involve at least two of these three factors in combination. A long-haul flight, for instance, combines prolonged immobility with relative dehydration and lower cabin pressure, which increase blood viscosity. Major surgery combines a period of anaesthetic-induced immobility with the hypercoagulable state that follows tissue injury. Understanding which factors apply to your situation is directly relevant to how compression fits into your risk reduction or management approach.

Who Is at Highest Risk of DVT?

DVT risk is not evenly distributed. NICE guidance on venous thromboembolism identifies key risk categories like active cancer, age over 60, BMI ≥30, immobility, and recent surgery, covering many everyday clinical scenarios. Surgical patients, particularly those undergoing orthopaedic procedures such as hip or knee replacement, face some of the highest perioperative DVT risk and receive compression as part of standard hospital care. Cancer patients have a significantly elevated risk due to the hypercoagulable state that many malignancies produce, as well as the immobility associated with treatment. Pregnancy and the immediate postpartum period raise DVT risk substantially, driven by hormonal changes that increase clotting tendency and the mechanical pressure of the uterus on pelvic veins.

Other significant risk factors include previous DVT or pulmonary embolism, inherited thrombophilia disorders such as factor V Leiden or prothrombin gene mutation, obesity, smoking, use of combined oral contraceptives or hormone replacement therapy, and prolonged immobility from any cause, including bed rest, long journeys, or sedentary work.

Age is an independent risk factor:

DVT incidence approximately doubles with each decade after 40. Having multiple risk factors simultaneously raises risk multiplicatively rather than additively, which is why risk stratification tools such as the Wells score exist to help clinicians estimate probability before ordering confirmatory imaging.

What Is Post-Thrombotic Syndrome?

Post-thrombotic syndrome, abbreviated to PTS, is the most common long-term complication of DVT and develops as a consequence of two related processes: persistent venous obstruction from incomplete clot resolution, and damage to the venous valves caused by the inflammatory response to the clot. These changes produce chronic venous hypertension in the affected limb, which drives the swelling, aching, heaviness, skin changes, and in severe cases venous ulceration that characterise PTS. Research published in the Journal of Thrombosis and Haemostasis found that post-thrombotic syndrome (PTS) develops in 20-50% of DVT patients within two years, with severe PTS in 5-10%. Compression stockings are the primary evidence-based intervention for managing PTS once it has developed.

How Compression Socks Help with DVT

Compression socks address DVT in two distinct and separate ways, and it is important to understand which applies to your situation because the garment type, compression level, and timing of use differ between them. In prevention, compression reduces the venous stasis that contributes to clot formation by improving the velocity of blood flow in the deep veins during periods of immobility. In post-DVT management, compression reduces the chronic venous hypertension that drives post-thrombotic syndrome by supporting the compromised venous valves and reducing fluid accumulation in the affected limb.

These two roles operate through the same physiological mechanism, graduated external pressure applied from ankle to knee that narrows the superficial and deep veins, increases blood flow velocity, and reduces the pressure that drives fluid into the surrounding tissue, but they apply to very different clinical situations with different risk profiles and different requirements for medical involvement.

Compression Socks for DVT Prevention

In the prevention context, compression socks work by counteracting venous stasis. When you sit still for several hours, the calf muscle pump, which normally contracts with each step to push blood upward through the leg veins, becomes largely inactive. Blood slows in the deep veins of the calf, and in people with additional risk factors, this slowing creates conditions in which clot formation becomes more likely. Graduated compression socks increase blood flow velocity in the deep femoral vein by reducing the cross-sectional area of the superficial veins, which pushes a greater proportion of venous return through the deeper, faster-flowing vessels.

The Cochrane systematic review on compression stockings for air travel found that graduated compression stockings significantly reduced symptomless DVT incidence in airline passengers on long-haul flights compared to no socks. NICE guidance recommends anti-embolism stockings as part of VTE prophylaxis for hospitalised patients at increased risk, excluding those with arterial complications or skin conditions. The evidence for compression in DVT prevention is well established across multiple high-risk contexts.

Compression Socks After a DVT Diagnosis

The role of compression after a DVT has been diagnosed is to manage the venous consequences of the clot rather than to prevent new ones from forming. Once a DVT has been confirmed and anticoagulation treatment has been initiated, the immediate objective shifts to reducing PTS risk and managing the swelling and pain that the clot itself produces. Compression socks reduce the oedema and heaviness in the affected limb by supporting venous return through the partially obstructed vessel and by compressing the surface veins so that venous pressure at the ankle is reduced.

The SOX trial published in The Lancet was a large, multicenter RCT involving 806 patients with proximal DVT. It found elastic compression stockings (30-40 mmHg) did not significantly reduce post-thrombotic syndrome (PTS) incidence compared to placebo socks. This challenged prior assumptions about routine compression use for PTS prevention. However, subsequent analysis and clinical practice guidance continue to recommend compression for symptom management in the acute and chronic phases of DVT, and compression remains the standard of care for managing PTS once it develops. The key distinction is between using compression to prevent PTS from occurring, which remains an area of evolving evidence, and using it to manage PTS symptoms once they are present, for which the evidence is considerably stronger.

DVT, Compression, and the Critical Safety Question

Before discussing compression levels, garment types, or fitting, there is a question that must come first:

Is it safe to wear compression socks at all, given your specific situation? This is not a precautionary formality. It is a genuine clinical question with a real safety answer that determines everything that follows.

Compression socks are not appropriate for everyone with a DVT history or risk profile. The most important contraindication is peripheral arterial disease. If the arteries supplying blood to the legs are narrowed or damaged, applying external compression to the leg reduces the perfusion pressure available to the tissues below the garment and can cause ischaemia, tissue damage, or, in severe cases, limb loss. An ankle-brachial pressure index assessment, which compares blood pressure at the ankle to blood pressure at the arm, is the standard test used to confirm that arterial circulation is adequate before compression is prescribed. Anyone with symptoms of peripheral arterial disease, including leg pain on walking that resolves with rest, cold or discoloured feet, or absent pedal pulses, must be assessed before any compression is used.

When to Seek Medical Assessment Before Using Compression Socks

Medical assessment before starting compression socks is strongly advisable, and in some cases essential, in the following situations.

• You have an active, confirmed DVT that has not yet been fully assessed and treated by a clinician

• You have symptoms consistent with DVT that have not been investigated, including unilateral leg swelling, warmth, and pain in the calf or thigh

• You have a history of peripheral arterial disease, claudication, or previous arterial procedures

• You have diabetes with peripheral neuropathy, as reduced sensation in the feet makes it harder to detect whether a garment is fitting incorrectly

• You have severe heart failure, as compression can shift fluid centrally and increase cardiac workload in a compromised heart

• You have a confirmed hypercoagulable disorder and are making compression decisions as part of ongoing thromboprophylaxis

If any of these apply, consult your GP or vascular team before purchasing or applying any compression garment. This is the most important piece of guidance in this article.

Compression Levels for DVT Prevention and Management

Compression socks for DVT contexts are rated in millimetres of mercury, or mmHg, describing the pressure applied at the ankle. The correct level depends entirely on the context: prevention during travel or immobility, post-DVT management in the acute phase, or long-term maintenance for post-thrombotic syndrome. Each situation has a different clinical requirement, and using a level that is appropriate for one context in another can either underdeliver on therapeutic effect or create safety concerns.

The graduated nature of the compression is what makes it effective. The pressure is highest at the ankle, where venous pooling is greatest, and it reduces progressively toward the knee. This gradient assists venous return by encouraging blood to move upward rather than pooling in the lower leg. A garment that applies uniform pressure rather than a graduated gradient does not achieve this effect and is not appropriate for clinical use.

15 to 20 mmHg: Prevention During Travel and Immobility

This level is appropriate for DVT prevention during prolonged travel, including flights longer than four hours, long-distance rail or road journeys, or any extended period of immobility where DVT risk is elevated but no DVT has been diagnosed. It is also suitable for people with moderate risk factors, such as a family history of DVT or the use of combined oral contraceptives, who want to reduce their baseline risk during higher-risk situations. At this level, the garment is relatively straightforward to apply, comfortable for extended wear, and available without a prescription, making it practical for self-managed prevention in everyday situations.

20 to 30 mmHg: Post-DVT Management and PTS

This is the most commonly used compression level for post-DVT management and the treatment of post-thrombotic syndrome. It provides sufficient pressure to reduce venous hypertension in a limb with damaged valves, manage the swelling and pain that PTS produces, and support the compromised venous return through a partially recanalised deep vein. Main Squeeze Compression Socks at 20 to 30 mmHg carry MHRA registration as medical-grade compression garments, confirming they meet the clinical standards required for therapeutic use at this level. For people who have completed their anticoagulation treatment following DVT and are managing post-thrombotic symptoms on an ongoing basis, this is the compression level most likely to make a meaningful difference to daily comfort and function.

30 to 40 mmHg: Severe Post-Thrombotic Syndrome

Firm compression in the 30 to 40 mmHg range is used for severe PTS, where standard moderate compression has proved insufficient to control swelling and venous hypertension, and for patients with significant chronic oedema following recurrent DVT. At this level, the application requires donning aids, and wearing the garment requires an adequate arterial blood supply confirmed by ABPI assessment. Self-prescribing at this level without clinical involvement is not advisable. Management of severe PTS at this compression level is typically coordinated with a GP, vascular nurse, or specialist rather than self-managed independently.

DVT Compression Levels at a Glance

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Anti-Embolism Stockings vs. Graduated Compression Socks

One of the most common sources of confusion in DVT management is the difference between anti-embolism stockings and graduated compression socks. They look similar and both apply pressure to the leg, but they serve different purposes and are designed for different situations. Using one where the other is indicated produces either inadequate therapy or an inappropriate level of pressure for the clinical context.

Anti-embolism stockings, sometimes called TED stockings, are designed specifically for use during bed rest in a hospital or surgical setting. They are calibrated for a supine patient, applying a lower pressure profile appropriate for someone who is lying down and not ambulant. They are not designed for use during walking or daily activity, and wearing them in an upright, mobile setting does not deliver the pressure gradient they are rated to provide in the supine position for which they are calibrated.

Why Graduated Compression Socks Are Different

Graduated compression socks are calibrated for use in an upright, ambulant patient. They apply the higher ankle pressures required to overcome the hydrostatic pressure of standing upright and to assist venous return in someone who is walking, standing, or sitting in a dependent position during the day. For post-DVT management, post-thrombotic syndrome, and DVT prevention during travel or daily activity, graduated compression socks are the correct garment type. Anti-embolism stockings, by contrast, are appropriate during a hospital admission involving bed rest and are prescribed by the clinical team managing that admission. They are not intended for self-managed, community-based use in ambulant patients.

This distinction matters practically because some people discharged from the hospital after a DVT continue wearing the anti-embolism stockings they were given during their admission, under the impression that they are providing equivalent protection to a graduated compression sock in daily life. They are not. If you have been discharged following DVT treatment and require compression for ongoing management, your clinical team should advise you on the appropriate graduated compression garment for community use.

Choosing the Right Style of Compression Garment for DVT

The appropriate style of compression garment for DVT prevention or post-DVT management depends on the location of the clot or the predominant site of post-thrombotic symptoms, and on the practical requirements of daily life. Most DVTs occur in the calf veins or the popliteal vein just behind the knee, and knee-high graduated compression socks provide adequate coverage for the lower leg venous system in these presentations.

Knee-high compression socks are the most practical and widely used style for both DVT prevention and post-DVT management. They cover the ankle and calf, where venous pooling is most pronounced, and they are considerably easier to apply than thigh-high stockings or full-length tights. For most people managing post-thrombotic syndrome affecting the calf and ankle, a well-fitted knee-high sock in the correct compression level addresses the primary area of venous insufficiency without the additional complexity of a longer garment.

Thigh-High Stockings for Proximal DVT

Thigh-high graduated compression stockings are indicated when the DVT involves the femoral or iliac veins, which are above the knee, or when post-thrombotic syndrome produces significant swelling and symptoms in the thigh as well as the calf. A knee-high sock that covers only the lower leg does not address venous hypertension in the thigh, and the compression edge at the knee can create an inadvertent constriction point above the symptomatic area. If your DVT was a proximal clot, discuss with your clinical team whether thigh-high compression is more appropriate for your specific situation.

Bilateral vs. Unilateral DVT

DVT most commonly affects one leg at a time, and post-thrombotic syndrome typically presents more severely in the leg where the clot occurred. Compression is applied to the affected limb, but some clinicians recommend bilateral compression when both legs have DVT risk factors or when the unaffected leg also has venous insufficiency. If you have experienced DVT in one leg and are unsure whether compression is needed bilaterally, your GP or vascular team can advise based on your specific clinical picture.

How to Measure for Compression Socks After DVT?

Measuring correctly for compression socks after a DVT is more complex than standard compression sizing because the affected limb may be acutely swollen in the days and weeks following the clot, and a sock sized to the swollen limb will be too large once the acute swelling resolves. Equally, a sock sized to the unaffected leg may be too small for the affected limb if significant post-thrombotic oedema is present.

The general guidance for post-DVT fitting is to measure the affected limb first thing in the morning, when overnight leg elevation has reduced acute swelling to as close to its baseline as possible. This gives you a measurement that reflects the chronic change in limb size rather than the peak acute swelling, and a sock fitted to this measurement will remain appropriate as acute inflammation settles. If swelling is severe in the early weeks following DVT, your clinical team may advise beginning with multi-layer bandaging to reduce limb volume before a compression sock is fitted, rather than sizing to the acutely swollen limb directly.

Measurement Points for Post-DVT Compression

• Measure first thing in the morning, after a night of leg elevation if possible

• Use a flexible fabric tape measure rather than estimating from shoe size or clothing size

• Measure the ankle circumference at the narrowest point, just above the ankle bone

• Measure the calf at its widest point, typically at the mid-calf

• For thigh-high stockings, measure the thigh at its widest point and the floor-to-gluteal-fold length

• Compare both measurements against the size chart for the specific product you are purchasing

• If the affected limb is significantly larger than the unaffected one, size to the affected limb

• If your measurements fall at the boundary between two sizes, size down for firmer therapeutic compression and up for comfort

Main Squeeze Compression Socks are available in a wide-calf option for limbs where post-thrombotic oedema or existing venous disease takes the calf circumference above the standard range. A sock that is too narrow at the calf creates a constriction band rather than a graduated gradient, which impairs the very mechanism the sock is designed to support. Accurate sizing is not a minor detail in DVT management. It is the foundation on which effective compression therapy is built.

How to Apply Compression Socks in the Context of DVT

The application technique for compression socks in a post-DVT context follows the same section-by-section approach as standard compression use, but with particular attention to two additional concerns: the possibility of residual limb tenderness in the acute post-DVT period, and the need to avoid creating any localised pressure points that could impair circulation in a limb with damaged venous architecture.

Turn the sock inside out down to the heel. Position the foot section over the foot with the heel cup sitting directly over the heel. Roll the sock upward in small increments, smoothing the fabric flat at each stage before moving further up the calf. Pay attention to the ankle and lower calf, which are often the most symptomatic areas in post-thrombotic syndrome, and ensure the compression zone is wrinkle-free across the entire surface. A single fold or wrinkle in the compression zone of a 20 to 30 mmHg sock creates a localised pressure line that, against a limb with venous disease and potentially compromised skin integrity, can cause tissue damage over a day of wear.

When Application Is Physically Difficult

Post-DVT patients recovering from orthopaedic surgery, those with reduced lower limb mobility, or those whose limb volume makes application genuinely difficult should use a donning aid from the outset. Frame-style donning aids allow the sock to be pre-loaded and the foot inserted without requiring a tight grip or significant forward bending. Rubber gloves with a textured surface improve grip considerably and allow more precise control during the rolling stage. Apply compression socks before standing up in the morning wherever possible, when the leg is at its least swollen, and the sock will go on with the least resistance and the most accuracy.

When and How Long to Wear Compression Socks for DVT

Apply compression socks first thing in the morning, before standing up, when the limb is at its smallest, and the graduated pressure gradient of the sock will work most effectively from the outset of the day. For DVT prevention during travel, put them on before leaving the house or at a minimum before boarding the vehicle or aircraft. For post-DVT management and post-thrombotic syndrome, daily morning application before rising is the standard practice.

The duration of compression use after DVT varies depending on clinical guidance and individual response. During the acute phase immediately following DVT diagnosis, your clinical team will direct the use of compression as part of your overall management plan. For long-term PTS management, compression socks are typically used on an ongoing daily basis, with the duration and compression level reviewed periodically by the managing clinician as symptoms evolve.

Travel and DVT: A Specific Risk Context

Travel deserves particular attention because it is one of the most common DVT risk contexts that people manage independently without clinical involvement. A study in the British Medical Journal found the risk of venous thromboembolism approximately doubled for flights over four hours compared to non-travel periods, with risk increasing further with each additional two-hour increment of flight time. For people with additional risk factors, including a previous DVT, the risk multiplies further.

Wearing graduated compression socks at 15 to 20 mmHg for the entire duration of a flight longer than four hours, keeping well hydrated, and moving the feet and calves regularly during the flight through calf raises and ankle rotations are the three most evidence-supported strategies for DVT prevention during air travel. Removing the socks only after you have been mobile for a period following landing reduces the risk during the disembarkation and post-flight period when immobility continues.

Signs That Compression Is Not Working or May Be Causing Harm

Remove compression socks immediately and seek medical advice if you notice any of the following during or after wear: new or worsening pain in the calf or thigh that is not clearly related to the pressure of the garment; increased warmth or redness in the affected limb; blue or white discolouration of the foot or toes; significant numbness or tingling in the foot; or a visible band of red or irritated skin at the top of the sock. In the context of a known DVT history, new symptoms in the affected limb warrant medical assessment rather than a wait-and-see approach.

What to Look for in a Compression Sock for DVT?

For a condition with direct safety implications, the quality and clinical validity of the compression garment matter considerably more than it does for general leg support. A sock that does not deliver its rated mmHg at the ankle does not provide adequate DVT prevention during travel. A sock that applies uniform rather than graduated pressure does not manage post-thrombotic venous hypertension effectively. The features that distinguish a genuinely therapeutic garment from a loosely labelled support product are specific and verifiable.

MHRA Registration

In the UK, compression garments used for therapeutic purposes should carry MHRA registration, which confirms that the product has been independently assessed against clinical standards and that the compression rating on the label is accurate and consistent. For DVT prevention and post-DVT management, this registration is not a marketing credential. It is confirmation that the garment delivers what its label claims. Main Squeeze Compression Socks carry MHRA registration as medical-grade compression products, which is the appropriate standard for therapeutic use in a clinically significant condition rather than general comfort wear.

Verified Graduated Compression

A genuinely graduated compression sock delivers measurably more pressure at the ankle than at the knee. The gradient is the mechanism through which the sock assists venous return rather than simply applying pressure to the leg. Some products describe themselves as compression socks whilst applying approximately uniform pressure throughout, which does not create the directional flow gradient that DVT management requires. When evaluating a product, look for confirmation that the ankle and knee pressures have been independently measured and that the gradient has been verified, not estimated. MHRA-registered garments meet this requirement as a condition of registration.

Durability and Compression Retention

Compression socks for post-DVT management are worn daily, often for many months or years, and the elastic fibres that generate the compression degrade through washing and wearing. A garment that has lost its elasticity no longer delivers its rated pressure, which, for someone managing post-thrombotic syndrome, means progressive under-treatment as the garment ages. Replace compression socks every three to six months with daily use, and use the morning ankle firmness test as a practical indicator: if you can gather loose material at the ankle after correct application, the compression has fallen below its therapeutic threshold and the garment needs replacing.

Final Thoughts

DVT is a condition where the stakes of getting compression wrong are higher than in most other contexts. Using compression when arterial circulation is compromised, using it instead of seeking assessment for suspected active DVT, or using anti-embolism stockings in an ambulant setting when graduated compression is required are all errors with real clinical consequences. This article has been written to ensure you understand those distinctions before making any decisions.

If your situation involves DVT prevention during travel and you have no significant additional risk factors, 15 to 20 mmHg graduated compression socks worn for the duration of the journey represent a well-evidenced, safe, and practical starting point. Measure your ankle and calf circumference before purchasing, apply the socks before travel begins, and keep moving regularly throughout the journey.

If your situation involves managing post-thrombotic syndrome after a confirmed and treated DVT, 20 to 30 mmHg is the appropriate maintenance compression level for most people. Apply socks before rising each morning, measure correctly at the ankle and calf, and replace every three to six months. Main Squeeze Compression Socks are available in both 15 to 20 mmHg and 20 to 30 mmHg with MHRA medical-grade registration, a wide-calf option for limbs above the standard range, and verified graduated compression from ankle to knee.

If your situation involves active DVT symptoms, severe post-thrombotic syndrome, or any of the contraindications listed earlier in this article, speak to your GP before selecting or applying any compression garment. The right compression sock, used in the right situation, is a meaningful clinical tool. Used in the wrong one, it is a risk.

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Frequently Asked Questions

Can I use compression socks if I currently have an active DVT?

You should not self-prescribe compression socks if you currently have symptoms consistent with an active DVT, including unilateral leg swelling, warmth, pain, and redness, without first being assessed by a clinician. Active DVT requires anticoagulation treatment as the primary intervention, and compression socks are introduced as part of a managed treatment plan rather than as an independent first response. Applying compression to an undiagnosed or untreated DVT without clinical guidance is not a safe practice. If you suspect a DVT, contact your GP or attend an urgent care service rather than purchasing compression socks as an initial response.

How long do I need to wear compression socks after a DVT?

The duration of compression sock use after DVT depends on the clinical picture and the guidance of the team managing your treatment. In the acute phase, compression use is typically directed by the clinician. For post-thrombotic syndrome, ongoing daily use is standard, with the duration and level reviewed periodically. Some guidelines recommend compression for a minimum of two years following proximal DVT to manage PTS risk. Your GP or vascular team will advise on the duration appropriate for your specific situation based on clot location, severity of post-thrombotic symptoms, and your overall venous health.

Do compression socks replace anticoagulation after DVT?

No. Anticoagulation medication, such as apixaban, rivaroxaban, or warfarin, is the primary treatment for acute DVT and the primary tool for preventing clot extension and pulmonary embolism. Compression socks address the venous consequences of the clot, including swelling and post-thrombotic symptoms, but they have no anticoagulant effect and do not prevent new clot formation or treat an existing one. They are used alongside anticoagulation during the treatment phase and as a long-term maintenance tool after anticoagulation has been completed, not as an alternative to it.

Can I prevent DVT on a long flight with compression socks alone?

Compression socks significantly reduce DVT risk during long-haul flights, but they are most effective when combined with adequate hydration and regular calf muscle activation during the journey. For people with multiple DVT risk factors, a GP should be consulted before travel to discuss whether additional prophylaxis, such as low molecular weight heparin injection, is appropriate alongside compression. For people with a previous DVT, the risk associated with long-haul travel is elevated enough that this conversation with a clinician is not optional.

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