Caprini Score for Venous Thromboembolism (2005)

• While many hospitals have developed institution-wide policies for VTE prophylaxis based on risk assessment models, prophylaxis choice and duration should ultimately be individualized based on patient factors and surgeon judgment.
• The score threshold defining “very high risk” varies by surgical population; do not apply a single cutoff universally:
  
  • ≥5 for general surgery.
  • ≥10 for total joint arthroplasty.
  • ≥12 for hip fracture.
  • ≥9 for most other surgical groups.

The following are prophylaxis recommendations based on Caprini score for general surgical patients (thresholds and guidance vary by specialty; see additional guidance below):

• Score 0 (lowest risk): Early frequent ambulation alone or mechanical prophylaxis (pneumatic compression devices or graduated compression stockings) during hospitalization.
• Score 1–4 (low to moderate risk): Mechanical prophylaxis with pneumatic compression devices ± graduated compression stockings during hospitalization.
• Score 5–6 (high risk): Pneumatic compression devices and consider low-dose heparin or low molecular weight heparin (LMWH) for 7–10 days total.
• Score 7–8 (high risk): Pneumatic compression devices plus low-dose heparin or LMWH for 7–10 days total.
• Score ≥9 (highest risk): Pneumatic compression devices plus low-dose heparin or LMWH for 30 days total.

Additional guidance:

• Tiered recommendations are generally consistent with ACCP Antithrombotic Therapy and Prevention of Thrombosis (AT9) guidance; refer to ACCP guidelines (particularly for general and abdominal-pelvic surgery) and specialty-specific protocols for details. 
• Evidence supporting a threshold at which pharmacologic prophylaxis shows clearer VTE reduction (Caprini ≥7) comes from a meta-analysis of 13 studies. 
• In total joint arthroplasty, a threshold of ≥10 has been used to identify patients who may benefit from traditional anticoagulants vs aspirin.
• Specialty-specific thresholds (e.g., ≥10 for joint arthroplasty, ≥12 for hip fracture) are described in a review and supported by a systematic review across specialties.

• Always assess bleeding risk before initiating pharmacologic prophylaxis; the Caprini score predicts VTE risk only and does not account for hemorrhage risk.
• Do not overlook personal or family history of VTE or thrombophilia; these are among the strongest predictors in the model and are frequently missed when the history is obtained quickly or via chart review alone.
• Apply specialty-appropriate thresholds; using the general surgery cutoff (≥5) may misclassify risk in other populations.
• Reassess the score throughout hospitalization, as new risk factors (e.g., central venous catheter placement, infection requiring IV antibiotics, prolonged immobility) can add points and change prophylaxis decisions.
• High scores should not override clinical contraindications to anticoagulation; always weigh VTE risk against active bleeding, thrombocytopenia, recent neurosurgery, or other patient-specific factors.
• In very high-risk patients (score ≥9), consider whether extended post-discharge prophylaxis is appropriate, particularly following major abdominal-pelvic surgery for cancer where guidelines support up to 28 days of LMWH.