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| | Differential Diagnosis |
 | | Other diseases (eg, malignancy, nephrotic syndrome, polycythemia, or thrombocytosis), including congenital prothrombotic states, should be considered in the differential diagnosis of APS. |
 | | Antiphospholipid syndrome can present with arterial or venous thrombosis as can homocystinemia and prothrombin 20210 mutation, whereas patients with protein C, protein S, antithrombin III deficiency, and factor V Leiden usually present only with venous thrombosis. |
 | | Conditions such as uterin abnormalities, fetal genetic abnormalities, as well as heritable procoagulant states also should be considered in the differential diagnosis of pregnancy events. |
| www.arthritis.org /research/Bulletin/vol52no3/DifferentialDiagnosis.asp (96 words) |
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