SandBox
| Examples of prediction rules | |
|---|---|
| Risk Score | Purpose |
| colspan=2|Cardiovascular diseases | |
| Active cancer (treatment within last 6 months or palliative) | 1 |
| Calf swelling >3 cm compared to other calf (measured 10 cm below tibial tuberosity) | 1 |
| Collateral superficial veins (non-varicose) | 1 |
| Pitting edema (confined to symptomatic leg) | 1 |
| Swelling of entire leg | 1 |
| Localized pain along distribution of deep venous system | 1 |
| Paralysis, paresis, or recent cast immobilization of lower extremities | 1 |
| Recently bedridden > 3 days, or major surgery requiring regional or general anesthetic in past 12 weeks | 1 |
| Previously documented DVT | 1 |
| Alternative diagnosis at least as likely | - 2 |
| Variable | Score |
|---|---|
| Age | |
| 60–79 years | 1.0 |
| 80+ years | 2.0 |
| Previous venous thromboembolism | |
| History of prior DVT or PE | 2.0 |
| Previous surgery | |
| Recent surgery within 4 weeks | 3.0 |
| Heart rate | |
| Heart rate >100 beats per minute | 1.0 |
| PaCO2 (partial pressure of CO2 in arterial blood) | |
| <35mmHg | 2.0 |
| 35-39mmHg | 1.0 |
| PaO2 (partial pressure of O2 in arterial blood) | |
| <49mmHg | 4.0 |
| 49-59mmHg | 3.0 |
| 60-71mmHg | 2.0 |
| 72-82mmHg | 1.0 |
| Chest X-ray findings | |
| Band atelectasis | 1.0 |
| Elevation of hemidiaphragm | 1.0 |