Risk stratification in polycythemia vera based on thrombotic risk
| Risk category . | Age older than 60 y or history of thrombosis . | Cardiovascular risk factors* . |
|---|---|---|
| Low | No | No |
| Intermediate | No | Yes |
| High | Yes | — |
| Risk category . | Age older than 60 y or history of thrombosis . | Cardiovascular risk factors* . |
|---|---|---|
| Low | No | No |
| Intermediate | No | Yes |
| High | Yes | — |
Extreme thrombocytosis (platelet count > 1500 × 109/L) is a risk factor for bleeding. Its role as a risk factor for thrombosis is uncertain. Increasing leukocyte count has been identified as a novel risk factor for thrombosis, but confirmation is required.
— indicates not applicable.
Hypertension, hypercholesterolemia, diabetes, smoking (see “Other risk factors”).