| Lesion | Prevalence if no history of thrombosis, percent | Probability of thrombosis per pregnancy in carriers, percent |
| Factor V Leiden | 7.7 | 0.25 |
| Prothrombin gene mutation | 1.3 | 0.5 |
| Both factor V Leiden and prothrombin gene mutation | 0.1 | 4.6 |
| Antithrombin (ATIII) deficiency | 1.5 | 0.4 |
| Protein C deficiency | 3.3 | 0.1 |
| Protein S deficiency | 6.6 | |
| No abnormality | 0.03 |
