| | High risk conditions | Patients screened for FVL mutation | Patients carriers for FVL mutation |
| | Young patients (A group) | 35 | 24 (68.6%) | | Pregnancy | 9 | 6 (66.6%) | | Estrogen treatment | 5 | 3 (60%) | | Spontaneous DVT | 32 | 18 (56.2%) | | Extended DVT | 9 | 5 (55.5%) | | Recurrent DVT | 15 | 10 (66.6%) | | Family history of VTE | 11 | 5 (45.4%) | | Resistance to anticoagulant | 4 | 4 (100%) | | Long-haul air travel | 2 | 1 (50%) |
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