What Tests to Order for Possible Brain Bleed
Order an immediate non-contrast CT head as the first-line test—it is the gold standard for detecting acute intracranial hemorrhage and can be performed rapidly in all patients. 1, 2
Initial Diagnostic Approach
Primary Imaging: Non-Contrast CT Head
Non-contrast CT is the definitive initial test because:
- Highest sensitivity for acute hemorrhage detection
- Fastest acquisition time (critical in emergency settings)
- Universally available 24/7 in most emergency departments
- No contraindications (unlike MRI with pacemakers/metal)
The 2022 AHA/ASA guidelines give this a Class I, Level B-NR recommendation for rapid neuroimaging to confirm ICH diagnosis 2. CT accurately identifies hemorrhage location, size, mass effect, and hydrocephalus within minutes 1.
Alternative: MRI with Gradient Echo Sequences
MRI (specifically gradient echo or T2* susceptibility-weighted sequences) is equally sensitive to CT for acute hemorrhage detection and more sensitive for prior hemorrhages 1. However, practical limitations often preclude emergent MRI:
- Longer acquisition time
- Limited availability
- Patient tolerance issues (claustrophobia, inability to lie still)
- Contraindications (implanted devices)
Use MRI as first-line only if: immediately available, patient stable, and no contraindications exist 1.
Additional Testing Based on Initial CT Findings
If Hemorrhage is Confirmed on CT:
1. Laboratory Tests to Order Immediately:
- Coagulation panel (PT/INR, aPTT, platelet count) - essential for anticoagulant-related hemorrhage management 1, 2
- Complete blood count - anemia and thrombocytopenia predict worse outcomes 2
- Serum glucose - hyperglycemia associated with poor outcomes 1
- Troponin - elevated levels predict increased mortality 1, 2
- Renal function - affects contrast decisions and predicts outcomes 2
2. Vascular Imaging - CTA Head (within first few hours):
Order CTA if any of these apply:
- Age < 55-65 years 1
- Lobar hemorrhage location 1
- No history of hypertension 1
- Presence of subarachnoid blood 1
- Unusual hematoma shape or location 1
- Edema disproportionate to hemorrhage age 1
CTA serves two purposes:
- Risk stratification for hematoma expansion (Class IIb recommendation) - identifies "spot sign" predicting expansion 1, 2
- Etiology identification (Class IIa recommendation) - detects aneurysms, AVMs, vascular malformations, tumors 1
Timing of Follow-up Imaging:
Repeat non-contrast CT within 24 hours (Class IIa recommendation) to assess for:
- Hematoma expansion (occurs in 28-38% if initial CT within 3 hours) 1, 2
- Development of hydrocephalus
- Increasing mass effect or herniation
- Particularly important if patient deteriorates neurologically 2
Special Considerations
When to Add MRI/MRA/MRV:
Consider after initial CT if:
- Suspected venous thrombosis - order MRV or CT venography if hemorrhage location, edema pattern, or sinus abnormalities suggest this 1
- Young patient with negative CTA - MRI more sensitive for small vascular malformations, cavernomas 1
- Suspected underlying tumor - contrast-enhanced MRI superior to CT 1
When to Proceed to Catheter Angiography:
Reserve for:
- High clinical suspicion despite negative non-invasive imaging 1
- Non-invasive studies suggestive but not definitive 1
- Pre-treatment planning for identified vascular lesions 3
Catheter angiography remains the gold standard for high-flow vascular malformations and aneurysms but carries procedural risks 3.
Common Pitfalls to Avoid
Don't delay CT for MRI availability - time is critical, and CT is sufficient for initial diagnosis 1, 2
Don't skip coagulation studies - warfarin-related hemorrhages have 8-fold higher expansion risk and require immediate reversal 1
Don't assume hypertensive hemorrhage in deep locations without vascular imaging in younger patients - 19% have underlying vascular lesions even with typical locations 4
Don't order contrast-enhanced CT as first-line - non-contrast is sufficient and faster for hemorrhage detection 5
In trauma patients, remember that 48% have normal CTA, but 19% have aneurysms and 14% have dissections - clinical judgment crucial 6