Absolute
- History of intracranial hemorrhage, intracranial neoplasm, arteriovenous malformation, or aneurysm 1
- Recent (<2 months) intracranial surgery or trauma 1
- Active or recent internal bleeding 1
Relative
- Known bleeding diathesis 1
- Non-haemorrhagic stroke within the prior 2 months1
- Surgery within the previous 10 days 1
- Thrombocytopaenia (platelets <100x109/l 1
- Uncontrolled severe hypertension (systolic BP >200mmHg or diastolic >110mmHg) 1