CT Angiography of the Aorta-Femoral Artery Bypass and Lower-Extremity Arteries — With and Without Contrast
A CT scan uses X-rays and contrast to evaluate the aorta, femoral arteries, and an aorta-femoral bypass graft for narrowing or other vascular problems.
["This imaging test checks blood flow and the condition of major arteries and a lower-extremity bypass graft."]
Key facts at a glance
- LOINC
- 30806-4
- Short code
- Deprecated Aorta+Fem a-Bl CT.Angio W+WO
- Synonyms
- Deprecated Aorta+Fem a-Bl CT.Angio W+WO
- 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-angio
- 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 angiography is an imaging test that creates detailed pictures of blood vessels. It may be used to assess the aorta, femoral arteries, and an aorta-femoral bypass graft, with images obtained before and possibly after intravenous contrast is given.
Why might I need this test?
This test may be ordered to evaluate symptoms such as leg pain, coldness, numbness, or reduced walking distance. It can also be used to check a bypass graft, plan a procedure, or investigate suspected narrowing, blockage, leakage, or another vascular complication.
How is the test performed?
You lie on a CT scanner while X-ray images are taken. If contrast is used, it is given through a vein in your arm; the scan may include images before and after contrast to show the arteries and how blood flows through them.
How do I prepare for the test?
Follow the imaging center's instructions, which may include fasting or avoiding certain medicines before contrast is given. Tell the care team about kidney disease, prior contrast reactions, iodine allergy, pregnancy, and any medicines you take, including diabetes medications.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Abnormal findings may indicate narrowing or blockage of a native artery or bypass graft, an abnormal connection or leak, or another problem affecting blood flow. The radiologist interprets the images in the context of your symptoms, medical history, and other tests. Follow-up imaging or treatment may be needed depending on the findings.
Short name
Aorta-femoral bypass CT angiography
Frequently asked questions
Is this test the same as a routine CT scan?
Does the test require intravenous contrast?
What if I have kidney disease or have reacted to contrast before?
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