The purpose of this study is to determine the feasibility of conducting a large trial examining the effect on clinical outcome of a liberal red blood cell (RBC) transfusion strategy compared to a restrictive strategy (usual care) in patients with aneurysmal subarachnoid hemorrhage (SAH).

Inclusion Criteria:

1. Age ≥18 years old at time of presentation
2. First ever episode aneurysmal SAH
3. Confirmed aneurysmal SAH diagnosis: as confirmed by treating Neurosurgeon or Neuro-interventionalist and supported by blood in subarachnoid space (demonstrated on cranial imaging or cerebrospinal fluid positive for xanthochromia) that is the result of a ruptured saccular aneurysm (confirmed by cranial imaging - cranial topography or magnetic resonance imaging angiography or catheter angiogram)
4. Incident hemoglobin ≤100g/L within 14 days following SAH (defined by first day of hospital presentation)

Exclusion Criteria:

1. Physician and or family decision to withdraw/withhold critical care at time of enrolment
2. Active bleeding with hemodynamic instability at time of enrolment
3. Patients with contra-indication or known objection to blood transfusions
4. SAH due to causes other than saccular aneurysm rupture including mycotic, traumatic and dissecting aneurysms, and aneurysms associated with arteriovenous malformations.