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CT Whole-Brain Perfusion and CT Angiography of Head and Neck Vessels with Contrast

Published: August 9, 2026Updated: August 16, 2026

CT brain perfusion evaluates blood flow to the brain, while head-and-neck CT angiography images the blood vessels that supply it.

Quick summary

["These CT studies help assess brain blood flow and narrowing or blockage of the arteries serving the head and brain."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
88315-7
Short code
CT WO+Brain perf+CTA Head+Nec ves W cont
Synonyms
CT WO+Brain perf+CTA Head+Nec ves W cont
Category
liver
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ct-perfusion-ct-angio
CPT
86430
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

What is this test?

CT brain perfusion measures how blood flows through different areas of the brain. CT angiography of the head and neck uses contrast and X-ray images to show the major blood vessels from the neck into the brain.

Why might I need this test?

These studies may be used to evaluate symptoms of a possible stroke, reduced blood flow, or a blood-vessel abnormality. They can also help doctors plan treatment and monitor conditions involving the brain's circulation.

How is the test performed?

You lie on a CT scanner table while the machine takes X-ray images. Intravenous contrast may be injected to improve the appearance of blood vessels, and brain perfusion may include a rapid series of images taken while contrast circulates.

How do I prepare for the test?

Tell your care team about prior contrast reactions, kidney disease, heart problems, and any possibility of pregnancy. Follow the facility's instructions, which may include avoiding food or drink before the examination.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Abnormal perfusion findings may indicate reduced or altered blood flow, including changes associated with stroke. Abnormal angiographic findings may include narrowing, blockage, or an abnormal vessel shape. Results should be interpreted with symptoms, examination findings, and other imaging or laboratory tests.

Short name

Brain perfusion and head/neck CT angiography

Frequently asked questions

Is this the same as a routine head CT?
No. A routine head CT mainly shows the structure of the brain, while perfusion and angiographic CT specifically evaluate blood flow and blood vessels.
Why is contrast used?
Contrast helps the blood vessels and changes in blood flow appear more clearly on the images. Some perfusion measurements also depend on tracking the contrast as it moves through the brain.
Is the test safe?
CT scans are generally well tolerated. Contrast can occasionally cause an allergic-like reaction or affect kidney function, so your care team should review relevant medical history before the scan.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

Medical Disclaimer

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