Table 3.
Prevalence of thrombotic risk factors in series of routinely investigated, consecutive adult patients with non tumorous and non cirrhotic, acute or chronic, PVT[126]
| Risk factor | PVT patients (%) |
| Myeloproliferative disorders | 30-40 |
| Atypical | 14 |
| Classical | 17 |
| Antithrombin deficiency | 0-26 |
| Protein C deficiency | 0-26 |
| Protein S deficiency | 2-30 |
| Factor V Leiden mutation | 6-32 |
| Prothrombine mutation | 14-40 |
| TT677 methylene tetrahydrofolate reductase (MTHFR) genotype | 11-50 |
| Antiphospholipid syndrome | 6-19 |
| Hyperomocisteinemia | 12-22 |
| Recent pregnancy | 6-40 |
| Recent oral contraceptive use | 12 |