Venous thromboembolism risk in surgical and medical inpatients (Caprini 2010).

What it is and when to use it

The Caprini Score (Caprini Risk Assessment Model) stratifies the risk of venous thromboembolism (VTE) —deep vein thrombosis and pulmonary embolism— in hospitalized patients, particularly surgical ones, by summing weighted points for clinical risk factors. It includes age, type and duration of surgery, prior VTE, thrombophilia, malignancy, immobility, obesity, oral contraceptive or hormone therapy use, pregnancy or postpartum, and other comorbidities. It guides the indication and intensity of thromboprophylaxis (mechanical and/or pharmacologic). It is one of the VTE risk assessment models recommended by the American College of Chest Physicians (ACCP/CHEST) guidelines for non-orthopedic surgical patients.

How to interpret it

The total score places the patient into risk bands. In the general/abdominopelvic surgery version, 0 points indicates very low risk; 1-2 points, low risk; 3-4 points, moderate risk; and ≥5 points, high risk. Higher scores reflect greater VTE risk and generally a stronger indication for adding pharmacologic prophylaxis to mechanical measures, always weighing the individual bleeding risk. Exact thresholds and prophylactic management can vary by population (e.g., plastic or orthopedic surgery) and institutional protocol, so they should be applied using the corresponding validated version.

Limitations and when not to use it

The model was developed and validated mainly in adult surgical patients (especially general, vascular, urologic, and plastic surgery); its application to medical, obstetric, or pediatric patients is less well established. It does not assess bleeding risk, which must be estimated separately before deciding on pharmacologic prophylaxis, nor does it replace clinical judgment or diagnostic testing when active VTE is suspected. A common misuse is treating it as a diagnostic tool or applying one version's thresholds to a population other than the one in which it was validated.

Frequently asked questions

When should I start pharmacologic thromboprophylaxis based on the Caprini score?

In general, patients with moderate-to-high scores (typically ≥3-5 points depending on the version) benefit from adding pharmacologic prophylaxis to mechanical measures, provided bleeding risk is acceptable. The final decision is individualized using the local protocol.

Is the Caprini score valid for non-surgical medical patients?

It was validated mainly in surgical patients. For hospitalized medical patients, dedicated models such as the Padua Prediction Score are often preferred, though some institutions adapt the Caprini score.

What is the difference between the Caprini score and the Wells score?

The Caprini score estimates the risk of developing VTE to guide prophylaxis, whereas the Wells score estimates the probability that a patient already has a DVT or PE to guide diagnosis. They are not interchangeable.