Endovenous laser ablation (EVLA) is a minimally invasive procedure that uses laser energy to permanently seal off malfunctioning veins, most commonly the great saphenous vein in the leg. It has largely replaced traditional vein-stripping surgery as the preferred treatment for varicose veins, with five-year success rates around 93%. The procedure is performed in an office or outpatient setting, typically takes under an hour, and most people return to work within a few days.
How Laser Energy Seals a Vein
The core idea is straightforward: a thin laser fiber is threaded inside the problem vein, and the laser heats the vein from within until the walls collapse and seal shut. But the biology is more nuanced than “laser burns vein.” The laser light is actually absorbed by the small amount of blood remaining inside the vein around the fiber tip. That blood, which is roughly 15% hemoglobin and over 60% water, heats rapidly and creates microscopic steam bubbles. Those bubbles transfer heat to the vein wall through convection, causing irreversible thermal damage that triggers the wall to contract and eventually scar closed.
Over the following weeks, the body gradually absorbs the sealed vein. Blood that previously pooled or flowed backward through the faulty vein reroutes through healthy deeper veins, which is why closing off the surface vein doesn’t cause circulation problems. Newer laser wavelengths (like 1940 nm) are absorbed more efficiently by the blood around the fiber, meaning they require less power and cause less risk of puncturing or ulcerating the vein wall compared to older devices.
What Happens During the Procedure
EVLA is performed under local anesthesia with ultrasound guidance throughout. Here’s what the experience looks like from your perspective:
First, the treatment team maps the problem vein with ultrasound. A needle puncture, usually near the knee or lower leg, gives access to the vein. Through that tiny opening, a thin catheter is guided up to the top of the vein, just below where it meets the deep venous system in the groin or behind the knee. The laser fiber is then threaded through the catheter and positioned precisely under ultrasound.
Before the laser fires, you receive tumescent anesthesia: a diluted numbing solution injected around the vein at intervals of 3 to 5 centimeters along its length. This fluid does several things at once. It numbs the area so you don’t feel the heat, compresses the vein down around the catheter for better contact, pushes blood out of the treatment zone, and creates a protective buffer of fluid between the vein and surrounding tissue so the heat doesn’t damage skin, nerves, or muscle.
With the anesthesia in place, the laser is activated and the fiber is slowly pulled back through the vein at a rate of about 1 to 2 millimeters per second. You may feel warmth or a slight tugging sensation, but the process is not painful. The entire withdrawal takes just a few minutes. Afterward, the small skin puncture is closed, and ultrasound confirms the vein has been sealed.
Recovery and Compression Stockings
Recovery is one of the biggest advantages over surgical stripping. Most people take 3 to 5 days off work, with some returning in as few as 2 to 3 days. You can walk immediately after the procedure, and in fact walking is encouraged to promote circulation.
Compression stockings are standard after EVLA, but how long you need to wear them is debatable. Traditionally, doctors recommended one to four weeks of daytime compression. However, recent research comparing short compression (two days or less) to longer compression (one week or more) found no significant differences in pain, recovery, or outcomes. A meta-analysis of five randomized trials did find that one week of compression modestly reduced pain at the one-week mark, so many physicians still recommend about a week. The bottom line: follow your provider’s instructions, but don’t be surprised if the recommendation is shorter than you expected.
Bruising along the treated vein is common, occurring in roughly 31% of patients. Soreness is generally mild, with average pain scores hovering around 1 out of 10 in studies. Most bruising and tenderness resolve within two to three weeks.
Risks and Complications
EVLA is considered very safe, but the most closely watched complication is something called endothermal heat-induced thrombosis (EHIT), which occurs in up to 3% of cases. This happens when heat from the procedure causes a blood clot to form at the junction where the treated surface vein meets a deep vein. Doctors classify EHIT on a four-level scale based on how far the clot extends:
- Class I: Clot reaches the junction but stays in the surface vein
- Class II: Clot extends slightly into the deep vein, blocking less than half the channel
- Class III: Clot blocks more than half of the deep vein
- Class IV: Complete deep vein blockage
Classes I and II are the most common and are typically managed with monitoring or short-term blood thinners. Classes III and IV are rare and treated more aggressively, similar to a standard deep vein thrombosis. A follow-up ultrasound within a few days of the procedure catches these early. Other potential side effects include temporary numbness along the treated area, skin discoloration, and, rarely, a small skin burn.
How It Compares to Other Treatments
The two main thermal alternatives are radiofrequency ablation (RFA) and traditional surgical stripping. All three have similar long-term effectiveness. At five years, occlusion rates are about 93% for EVLA, 94% for RFA, and 93% for surgery.
In head-to-head comparisons where patients had EVLA on one leg and RFA on the other, post-procedure pain scores were nearly identical (1.2 for EVLA versus 1.4 for RFA). Bruising was somewhat less common with EVLA (31%) than RFA (52%), though the difference wasn’t statistically significant. The practical experience of both procedures is very similar.
The 2023 clinical practice guidelines from the Society for Vascular Surgery and the American Venous Forum strongly recommend endovenous ablation (either laser or radiofrequency) over surgical stripping for patients with symptomatic varicose veins. Surgical stripping is now reserved for situations where endovenous technology isn’t available or the vein’s anatomy makes catheter-based treatment impractical. The guidelines also note that nonthermal options, such as medical adhesive or mechanochemical ablation, are equally acceptable alternatives depending on physician expertise and patient preference.
Insurance Coverage Requirements
Most insurance plans, including Medicare, cover EVLA when it meets specific medical necessity criteria. The bar is not simply having visible varicose veins. You typically need to demonstrate that the vein has backward blood flow (reflux) confirmed on ultrasound, that you have symptoms like pain, swelling, or skin changes, and that you’ve completed a six-week trial of conservative treatment first. Conservative treatment usually means wearing compression stockings and elevating your legs regularly.
For tributary veins (the smaller branching varicose veins), coverage generally requires that the main saphenous vein reflux has already been treated or ruled out, and that the veins are larger than 4 millimeters in diameter. Some nonthermal techniques have a coverage cap at 12 millimeters of vein diameter, but this limit doesn’t typically apply to laser ablation. If your provider recommends EVLA, expect to go through the conservative therapy trial first unless your symptoms are severe or you have complications like skin ulceration.
Who Is a Good Candidate
EVLA works best for people with a relatively straight saphenous vein that allows a catheter to pass smoothly from the access point up to the groin or knee junction. If your vein is significantly tortuous (twisted), the catheter may not advance properly, and your doctor may recommend a different approach. Active blood clots in the vein being treated are another reason to postpone or choose an alternative method.
The procedure treats the underlying source of varicose veins, not necessarily every visible bulging vein on the surface. After EVLA seals the main trunk vein, many of the smaller branching varicosities shrink on their own over weeks to months. Those that persist can be addressed separately with procedures like microphlebectomy or sclerotherapy, often at a follow-up visit.