Hospitalized medical patients face a meaningfully elevated risk of venous thromboembolism (VTE) from a combination of illness, inflammation, and reduced mobility — but not every patient needs pharmacologic prophylaxis, which carries its own bleeding risk. The Padua Prediction Score gives clinicians a standardized, 11-item way to separate patients who genuinely need prophylaxis from those who don't, replacing informal gestalt judgment with a validated, reproducible checklist.
How the Padua Prediction Score works
The score sums 11 binary clinical criteria, each independently additive with no caps or interactions between items. Four criteria — active cancer, previous VTE, reduced mobility, and known thrombophilia — carry the heaviest weight at 3 points each, reflecting their outsized contribution to clot risk in the derivation cohort. Recent trauma or surgery carries 2 points, and six remaining criteria (age 70+, heart/respiratory failure, acute MI or stroke, acute infection or rheumatologic disorder, obesity, and ongoing hormonal treatment) each carry 1 point. The maximum possible score is 20.
A score of 4 or higher identifies a patient as high risk for VTE, the threshold validated in the original Barbar et al. 2010 derivation and outcome study, which found VTE incidence in the high-risk group substantially higher than in the low-risk group when prophylaxis was withheld.
Who the score is for — and who it isn't
The Padua Prediction Score was derived and validated specifically in hospitalized medical patients — admissions for acute non-surgical illness such as heart failure, pneumonia, or infection. It is not intended for surgical patients, who have their own dedicated VTE risk-assessment models (such as the Caprini score), because the risk drivers and appropriate prophylaxis strategies differ meaningfully between the two populations.
Within the medical-patient population the score works as a screening filter: most hospitalized medical patients score low and don't need pharmacologic prophylaxis, while the roughly 40% who score high derive most of the population's prophylaxis benefit — concentrating an intervention with real bleeding-risk tradeoffs on the patients most likely to benefit from it.
From score to decision — the role of bleeding risk
A high Padua score signals that pharmacologic prophylaxis is generally indicated, but it is not, by itself, the whole decision. Anticoagulant prophylaxis carries a bleeding risk that must be weighed against the clotting risk the Padua score quantifies — a patient with a high Padua score and a concurrent high bleeding risk (active bleeding, severe thrombocytopenia, recent hemorrhagic stroke) may still be a poor candidate for pharmacologic prophylaxis, in which case mechanical options are typically favored instead.
This calculator computes the VTE-risk side of that equation only. It does not calculate a bleeding-risk score, check medication interactions, or verify contraindications — those require a clinician's full assessment before a prophylaxis decision is made.