π©Έ Padua Score Calculator
VTE risk in hospitalized medical patients, in 11 checks.
For informational purposes only, not medical advice. Consult a healthcare professional.
Hospitalized medical patients develop blood clots far more often than people realize, and most of those clots are preventable. The Padua prediction score, published by Barbar and colleagues in 2010, sorts medical inpatients into low and high risk for venous thromboembolism using 11 bedside risk factors. In the original study of over a thousand patients, those scoring 4 or more had a markedly higher clot rate, and preventive blood thinners cut that risk substantially. This calculator reproduces the score for education and clinical reference.
How to Use This Calculator
Check every risk factor that applies to the patient. The score adds the points automatically and classifies the total into low or high VTE risk.
Work through all 11 items. The heavy hitters worth 3 points each are active cancer, prior VTE, prolonged immobility, and known clotting disorders.
Add the 2-point item for recent trauma or surgery and the six 1-point items covering age, heart or lung failure, recent heart attack or stroke, acute infection, obesity, and hormones.
Read the total. Four or more points means high risk, the group where pharmacologic clot prevention showed clear benefit in the validation study.
How the Math Works
Each of the 11 items carries a fixed weight from the original derivation: four items score 3 points (active cancer, previous VTE, reduced mobility for at least three days, known thrombophilia), recent trauma or surgery scores 2, and six items score 1 (age 70 plus, heart or respiratory failure, acute MI or ischemic stroke, acute infection or rheumatologic disorder, obesity, hormonal therapy). The maximum is 20. The decision cut is 4: scores of 4 or higher define high risk, where the original trial showed pharmacologic prophylaxis reduced VTE. Below 4 is low risk, where mechanical measures or watchful waiting were the studied approach.
Worked Example
Consider a 72-year-old admitted with pneumonia who has been in bed for four days. That is 1 point for age, 3 for reduced mobility, and 1 for acute infection, totaling 5 points. The calculator classifies this as High VTE risk, the group where the Padua study showed preventive anticoagulation meaningfully reduced clot rates. Two of the three points came from the immobility item alone, which shows why getting patients moving matters as much as any drug.
Reading Your Result
A low score under 4 suggests standard care without routine blood thinners was the studied path, though bleeding risk and clinical judgment still rule. A high score of 4 or more identifies the patients for whom guidelines recommend pharmacologic prophylaxis when bleeding risk allows. The score is validated for acutely ill medical inpatients, not surgical patients, who have their own risk models like Caprini. Re-score if the picture changes: a new infection or a third bed-bound day can push a borderline patient over the line.
| Padua score | Risk | Studied approach |
|---|---|---|
| 0 to 3 | Low | Early mobilization, mechanical measures as needed |
| 4 or more | High | Pharmacologic prophylaxis if bleeding risk allows |
Limitations
The Padua score predicts clot risk, not bleeding risk, and blood thinners are only appropriate when bleeding risk is acceptable, which this tool does not assess. It was derived in Italian medical wards and may perform differently in other populations. It is a decision aid for clinicians and students, not a substitute for judgment, and prophylaxis choices must account for renal function, platelet count, and active bleeding.
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For informational purposes only, not medical advice. Consult a healthcare professional.
Frequently Asked Questions
What does the Padua score predict?
The risk of developing a venous thromboembolism, meaning deep vein thrombosis or pulmonary embolism, during hospitalization for an acute medical illness. It was designed for medical inpatients, the group where clot prevention is most often underused. It does not predict bleeding, which must be assessed separately before starting blood thinners.
Who created the Padua score?
Barbar and colleagues at the University of Padua in Italy, published in 2010. They studied 1,180 acutely ill medical patients, derived the 11-item weighted score, and showed that high-risk patients given prophylaxis had far fewer clots. The name comes from the city, not an acronym.
What counts as reduced mobility?
Being confined to bed or a chair, unable to walk, for at least three days, excluding the day of assessment nuances. In practice it means the patient is essentially immobile from the illness. Brief trips to the bathroom do not cancel it; being up and walking the ward does.
Why is the cutoff 4 and not higher?
Because that is where the validation data split. Patients scoring 4 or more had an 11 percent VTE rate without prophylaxis versus under 1 percent in the low-risk group, and prophylaxis cut the high-risk rate substantially. Moving the line higher would miss patients who benefited in the trial.
Can I use Padua for surgical patients?
No. Surgical patients have different risk drivers, including the operation itself and anesthesia time, and are better served by surgical models like the Caprini score. Padua was derived and validated in medical inpatients, and stretching it to surgical wards is outside its evidence.
Does a high score mean blood thinners are mandatory?
No. It means the clot risk is high enough that prophylaxis is recommended if bleeding risk is acceptable. Active bleeding, very low platelets, or a high bleeding risk can override the score. The decision always pairs a clot-risk tool with a bleeding-risk assessment and clinical judgment.
What is pharmacologic prophylaxis in practice?
Usually a low dose of heparin or low-molecular-weight heparin given under the skin once or twice daily during the hospital stay. It is a preventive dose, much smaller than treatment doses for an actual clot. Mechanical options like compression devices are used when drugs are unsafe.
How often should the score be repeated?
At admission and whenever the clinical picture changes. A patient admitted low-risk can become high-risk after a few immobile days or a new infection, and the score is cheap to redo. Many hospitals build it into admission and daily review workflows for exactly this reason.
Does obesity really add clot risk?
Yes. Obesity impairs venous return, creates a pro-inflammatory state, and is associated with higher VTE rates in hospitalized patients. In Padua it contributes 1 point at BMI 30 or above. It is one of the few risk factors a patient can modify long before any hospital stay.
What about patients already on blood thinners?
The score still describes their underlying risk, but the management question changes: they are already anticoagulated, so the issue becomes whether the current regimen is adequate rather than whether to start prophylaxis. Score them for documentation, then manage the existing therapy.