====== Cerebral blood flow ======

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Cerebral [[blood flow]] ([[CBF]]) is the blood supply to the [[brain]] in a given period of time. In an adult, CBF is typically 750 millilitres per minute or 15% of the cardiac output. This equates to an average perfusion of 50 to 54 millilitres of blood per 100 grams of brain tissue per minute.

===== 🧠 Comparison: Cerebral Blood Flow Testing vs Monitoring =====

^ Term ^ Definition ^ Temporal Nature ^ Purpose ^ Example Tools ^
| **[[Cerebral Blood Flow Testing]]** | One-time or episodic assessment of cerebral perfusion to answer a specific diagnostic question. | Snapshot / Single time point | Diagnosis or confirmation (e.g. brain death, no cerebral perfusion in TA-NRP) | CT/MR perfusion, radionuclide scan, transcranial Doppler (spot), angiography |
| **[[Cerebral Blood Flow Monitoring]]** | Continuous or repeated observation of cerebral perfusion over time. | Ongoing / Real-time or repeated | Trend analysis, intraoperative safety, critical care surveillance | Continuous TCD, cerebral NIRS, brain tissue oxygen sensors |

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**Key distinction**:  
*Cerebral blood flow testing* provides a diagnostic snapshot.  
*Cerebral blood flow monitoring* tracks changes over time for clinical management.






===== Cerebral blood flow regulation =====

[[Cerebral blood flow regulation]]