Perfusion of the Brain Using Cerebrospinal Fluid (CSF) Perfusion Dynamics
This test measures how blood flows through your brain tissue, often assessed indirectly via cerebrospinal fluid (CSF) analysis to evaluate brain health and blood supply.
["Helps doctors check if your brain is getting enough blood flow, useful in conditions like stroke, brain swelling, or vascular issues."]
Key facts at a glance
- LOINC
- 81579-5
- Short code
- PT.perfusion Brain W RNC IV
- Synonyms
- PT.perfusion Brain W RNC IV
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Ref low
- 0.8
- Ref high
- 1.2
- Critical range
- — – 5 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- pt-perfusion
- CPT
- 85610
- SNOMED
- 396252006
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
Why This Test Is Done
Your doctor may order this test if you have symptoms like sudden weakness, confusion, severe headaches, or neurological problems that could suggest poor blood flow to the brain. It may also be used before surgery or in cases where brain swelling or injury is suspected.
What to Expect Before the Test
No special preparation is needed. A sample of cerebrospinal fluid (CSF) is typically collected through a procedure called a lumbar puncture (spinal tap), where a needle is gently inserted into your lower back. The fluid is then tested for perfusion-related markers.
What the Test Results Mean
Results help identify if blood flow to the brain is impaired. Abnormal findings may indicate conditions like cerebral edema (swelling), vascular blockages, or other neurological disorders requiring further medical attention.
Common Conditions Monitored
This test is often used to monitor brain perfusion in patients with suspected strokes, traumatic brain injuries, or conditions causing brain swelling (e.g., tumors, infections). It may also guide treatment decisions for conditions like hypertensive emergencies.
Reference range
INR: 0.8-1.2 (warfarin: 2.0-3.0)N/A
Inform your healthcare provider if you are taking blood thinners. No special preparation required.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
Brain Perfusion Test
Frequently asked questions
What questions might you have about this test?
How long will I need to wait for results?
Is this test painful?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy