Criteria, other than a negative venogram or ultrasound, used to rule out deep vein thrombosis
| Criterion | Number of algorithms |
|---|---|
| Negative d-dimer in low risk patients | 20 |
| Negative d-dimer in low or moderate risk patients | 4 |
| Negative venometry in low risk patients | 1 |
| Negative d-dimer and venometry in low risk patients | 4 |
| Negative d-dimer in low risk patients or negative venometry in any patient | 2 |
| Negative d-dimer and venometry in any patient | 1 |
| Negative d-dimer in any patient | 2 |
| Low Wells score alone | 1 |
| None, other than negative ultrasound or venogram | 8 |