Villalta Score for Post-thrombotic Syndrome (PTS)

The Villalta score is the most widely used clinical tool for diagnosing and grading post-thrombotic syndrome (PTS) after lower-extremity deep vein thrombosis (DVT). PTS is a chronic complication of DVT caused by persistent venous obstruction, valvular damage, or both, leading to venous hypertension and long-term symptoms such as leg pain, swelling, heaviness, skin changes, and sometimes ulceration. The Villalta score was developed to standardize how clinicians identify and classify this condition, and it remains the most commonly endorsed scale in clinical studies and reviews.

What the Villalta score measures

The score combines 5 patient-reported symptoms and 6 clinician-assessed signs, each rated from 0 to 3 for absent, mild, moderate, or severe. The symptoms are pain, cramps, heaviness, paresthesia, and pruritus. The signs are pretibial edema, skin induration, hyperpigmentation, redness, venous ectasia, and pain during calf compression. A venous ulcer is recorded separately and automatically indicates severe PTS.

The item scores are summed to produce the total Villalta score, which is interpreted as follows:

• 0 to 4: no PTS
• 5 to 9: mild PTS
• 10 to 14: moderate PTS
• 15 or more, or venous ulcer present: severe PTS

Why it matters

PTS is the most common long-term complication of DVT and can substantially affect mobility, symptoms, skin integrity, and quality of life. Reviews published in recent years estimate that PTS develops in a substantial minority of patients after DVT, with incidence varying depending on population and definition used. Standardized assessment is therefore important both in follow-up care and in research. The Villalta score is useful because it is simple, bedside-based, and captures both symptoms and observable venous changes.

Strengths of the Villalta score

A major strength of the Villalta score is that it has been studied extensively and has shown good reproducibility, correlation with quality-of-life measures, and practical usefulness in both trials and clinical follow-up. A measurement-properties review concluded that the scale had acceptable validity and reliability and supported its use for defining and grading PTS. Later studies also found that Villalta scores correlate better with venous disease–specific and general quality of life than some alternative venous severity tools.

Because of this evidence base, the Villalta score is often described as the recommended or endorsed tool for PTS assessment in adults. Reviews and consensus-style papers continue to treat it as the standard clinical scale for lower-extremity PTS.

Limitations

Despite its widespread use, the Villalta score is not perfect. Its symptoms and signs are not specific to PTS and can overlap with primary chronic venous disease, varicose veins, obesity-related edema, musculoskeletal pain, and other conditions. This can make the score vulnerable to overdiagnosis or misclassification, especially in patients who already had venous symptoms before their DVT. Studies comparing the affected and unaffected legs, as well as more recent analyses, have highlighted this limitation.

Another limitation is that Villalta scores can fluctuate over time, particularly in milder cases. Some authors have argued that diagnosing PTS from a single assessment may overestimate disease frequency compared with requiring persistence over repeated visits.

Current role in practice

In modern practice, the Villalta score is best used as a structured clinical assessment tool, rather than as a stand-alone diagnostic truth. It helps clinicians describe severity consistently, monitor patients over time, and compare outcomes across studies. For lower-extremity DVT follow-up, it remains the default scoring system in most PTS literature.

The score is particularly valuable when paired with clinical judgment. A patient with a borderline Villalta score may still need broader evaluation of venous disease burden, functional impact, and ulcer risk. Likewise, a high score should be interpreted in context, especially if there is pre-existing chronic venous insufficiency.

Bottom line

The Villalta score is the standard clinical scale for assessing post-thrombotic syndrome after lower-extremity DVT. It is practical, validated, and useful for grading severity from mild disease to ulcerating severe PTS. Its main weakness is limited specificity, since the signs and symptoms it captures are not unique to PTS. Even so, it remains the most established tool for structured assessment and follow-up.

References

1. Kahn SR. The post-thrombotic syndrome. Hematology Am Soc Hematol Educ Program. 2016. Overview of PTS and standard Villalta scoring thresholds.
2. Kahn SR, et al. Measurement properties of the Villalta scale to define and classify the severity of the post-thrombotic syndrome. J Thromb Haemost. 2009. Review supporting validity and reliability of the Villalta scale.
3. Makedonov I, Kahn SR, Galanaud JP. Prevention and Management of the Post-Thrombotic Syndrome. J Clin Med. 2020. Clear summary of components, scoring, and clinical use.
4. Wik HS, Enden TR, Ghanima W, Sandset PM. Diagnostic scales for the post-thrombotic syndrome. Thrombosis Research. 2018. Review of available PTS scales and the role of Villalta.
5. Mangwani J, et al. Epidemiology and Diagnosis of Post-Thrombotic Syndrome. 2023 review discussing incidence and diagnostic approach.
6. Galanaud JP, et al. Comparison of the Villalta post-thrombotic syndrome score in the ipsilateral vs contralateral leg after a first unprovoked deep vein thrombosis. J Thromb Haemost. 2012. Highlights specificity concerns.
7. Engeseth M, et al. Limitations of the Villalta scale in diagnosing post-thrombotic syndrome. J Thromb Haemost. 2019. Discusses diagnostic limitations and potential misclassification.
8. Pop CT, et al. Exploring the Villalta scale to capture postthrombotic syndrome using ATTRACT trial data. Research and Practice in Thrombosis and Haemostasis. 2022. Supports use of a single Villalta score ≥5 for clinically meaningful PTS.