This investigation is performed to assess the veins of the upper limb for their suitability as bypass grafts, for fistulas and to exclude thrombosis of the vessel or other arteriovenous pathology.
There are no special instructions for this examination.
Patients are required to remove their shirt to enable scanning of the arm veins through the shoulder region and across the base of the neck, undergarments can be left on. Special ultrasound gel is applied to the skin, this is removed at the end of the scan. The gel allows the probe to pass freely across the skin as well improving the image quality. You may be asked to raise or lower the limb depending upon the investigation being performed.
The ultrasound examination will take approximately 20 to 30 minutes.
|B Mode||Doppler||Colour / Power|
|Colour fills lumen|
|Partial Clot||Some echoes,
|May be normal or
|Defect in colour|
|Thrombosed vessel||Filled with echoes,
|No Doppler signal||No colour fill|
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