Padua Score Calculator - 11-Factor VTE Risk Score

The Padua score calculator applies a 2010 Italian risk-stratification model to help hospital teams decide which medical inpatients need pharmacological VTE prophylaxis in addition to mechanical measures. Tick the 11 weighted risk factors, sum the points, and read the total against the >=4 high-risk threshold from the original Barbar cohort study.

• • Admission VTE risk review: A resident runs the 11 factors at admission to support the prophylaxis order.
• • Pharmacy and QI audit: A pharmacist flags patients on mechanical-only prophylaxis who should also receive pharmacological prophylaxis.
• • Pre-rounding handoff: A hospitalist documents the total in the handoff note for the next reviewer.

Barbar and colleagues at the University of Padua followed 1,180 medical inpatients for up to 90 days and reported 11.0 percent symptomatic VTE in high-risk patients who did not receive prophylaxis, against 0.3 percent in the low-risk group. The calculator mirrors that cohort's 11 variables and the >=4 threshold.

It is a record-organizing aid, not a treatment order. The result informs the discussion between the admitting team, the pharmacist, and the patient; it does not prescribe an anticoagulant, dose, or duration. Active bleeding, platelet count, recent surgery, and renal function still need their own review.

For another clinical risk-score pattern that walks a similar checklist of weighted variables, the 4TS Score calculator does the same job for heparin-induced thrombocytopenia pretest probability.

Each of the 11 risk factors is either 0 (absent) or its published weight (present). The calculator sums the weights into a Padua Prediction Score and flags the result against the <4 vs >=4 threshold.

The four strongest risk factors (active cancer, previous VTE, reduced mobility, and known thrombophilia) each carry 3 points, the 1-month trauma or surgery variable carries 2 points, and the six milder factors carry 1 point each. The maximum possible total is 20.

The <4 vs >=4 split is the same one Barbar used in 2010 and Vardi re-tested in a 2013 sepsis cohort.

According to Barbar et al. 2010, Journal of Thrombosis and Haemostasis, the 11 risk factors, the 3-2-1 point values, and the >=4 high-VTE-risk threshold for medical inpatients

When the obesity variable needs a fresh number from height and weight at the bedside, the BMI Calculator supports the kg/m^2 conversion before the 1-point tick is recorded.

The 11 Padua variables cluster into heavy-weight disease factors, a recency factor, and 1-point factors on baseline risk. Understanding the clusters helps the user challenge the inputs.

Barbar 2010 deliberately gave the four disease-cluster variables the largest weights to match their adjusted hazard ratios in the Cox model.

The 11 factors are read together with bleeding risk, kidney function, drug interactions, and the reason for admission. The Padua total is one input into the prophylaxis decision, not a replacement for the rest of the chart review.

For pregnant or postpartum patients, the VTE Risk in Pregnancy Calculator uses the pregnancy-specific risk factors and prophylaxis thresholds that Padua was not designed to cover.

Treat the calculator as a bedside checklist. Work through the 11 risk factors in any order, but record each input and the total so the next reviewer can challenge the choices.

1. 1 Confirm the patient is a medical inpatient: Padua is for medical inpatients (pneumonia, heart failure, COPD exacerbation, sepsis, acute infection). For surgical inpatients, especially orthopaedic or cancer surgery, prefer the Caprini score.
2. 2 Check the four 3-point variables first: Active cancer, previous VTE, reduced mobility, and known thrombophilia each carry 3 points. A single tick from this cluster often pushes the total across the 4-point threshold.
3. 3 Add the 2-point and 1-point variables: Tick the 1-month trauma or surgery variable if it applies, then add the 1-point factors.
4. 4 Read the total against the 4-point threshold: Under 4 is the low VTE risk band, where mechanical prophylaxis is the usual choice. 4 or higher is the high VTE risk band, where mechanical plus pharmacological prophylaxis is the usual next step.
5. 5 Re-weigh the result against bleeding risk: Pull the recent platelet count, haemoglobin, renal function, and any active bleeding. If bleeding risk is high, document the trade-off before starting LMWH or UFH.
6. 6 Record the total and reassess on day 3 or day 5: A new operation, infection, or period of bedrest changes the total. Re-run the calculator when the clinical picture changes, not only at admission.

A 72-year-old with community-acquired pneumonia, BMI 31, and NYHA III heart failure is admitted. The team ticks age 70 or older (1), heart or respiratory failure (1), obesity BMI 30 or higher (1), and acute infection or rheumatologic disorder (1). Total = 4. The team adds enoxaparin 40 mg subcutaneously once daily after confirming no active bleeding.

When a high Padua total is paired with new leg symptoms, the Age-Adjusted D-Dimer Calculator helps interpret the d-dimer that usually goes alongside the clinical exam before imaging is ordered.

A Padua review can be done with a pen and a paper checklist, but a calculator makes the tally consistent, traceable, and easier to defend during chart review or handoff.

• • Standardised review across providers: Residents, hospitalists, pharmacists, and nurses use the same 11 variables, so the discussion is less dependent on memory of the 2010 paper.
• • Transparent record-keeping: Each input and the total can be quoted in the chart note, so the next reviewer can challenge a specific variable rather than redo the assessment.
• • Quick link to the published threshold: The calculator returns the low vs high VTE risk band alongside the raw total, so the user does not re-look up the >=4 cutoff during a busy admission.

The Padua score was designed to make the medical inpatient VTE risk easier to discuss. The calculator keeps that goal front and centre but does not diagnose VTE, prescribe an anticoagulant, or replace the bedside review.

Several things can move the total up or down, and several things can move the clinical decision even when the total is unchanged.

• • The score is a record-organizing aid, not a treatment order. A low VTE risk band does not rule out VTE, and a high VTE risk band still needs a documented bleeding risk review before any LMWH or UFH order is signed.
• • The score was derived in a single Italian cohort and externally validated mainly in similar medical inpatient populations. It is not designed for surgical inpatients (where the Caprini score is more widely used), for pregnant or postpartum women, or for patients already on therapeutic anticoagulation at admission.

The four 3-point variables drive most of the high-VTE-risk classifications in real-world practice. A borderline total of 3 that ticks one of these clusters often moves to 6 or higher in the same admission.

According to Vardi et al. 2013, Journal of Thrombosis and Haemostasis, external validation of the Padua score in a sepsis cohort, with the same low vs high VTE risk split

For another clinical risk score that follows the same low-vs-high threshold pattern for a different inpatient decision, the Osteoporosis Risk Score returns a comparable summary on a separate clinical question.