4 doctors weighed in:

During dialysis why does the subclavian catheter have darker blood than in patients with a fistula?

4 doctors weighed in
Dr. James Cain
Internal Medicine - Nephrology & Dialysis
2 doctors agree

In brief: Venous blood

A subclavian catheter has only venous, deoxygenated blood returning from the body.
A fistula contains oxygenated arterial blood coming from the heart. This is the reason for the bright red blood seen in fistulas.

In brief: Venous blood

A subclavian catheter has only venous, deoxygenated blood returning from the body.
A fistula contains oxygenated arterial blood coming from the heart. This is the reason for the bright red blood seen in fistulas.
Dr. James Cain
Dr. James Cain
Thank
Dr. Eric Chen
Radiology

In brief: Fistula vs catheter

Dialysis catheters are placed in veins, and therefore use deoxygenated (dark) blood.
Dialysis fistula is a connection between an artery and a vein. The blood within a fistula is oxygenated, and therefore more red.

In brief: Fistula vs catheter

Dialysis catheters are placed in veins, and therefore use deoxygenated (dark) blood.
Dialysis fistula is a connection between an artery and a vein. The blood within a fistula is oxygenated, and therefore more red.
Dr. Eric Chen
Dr. Eric Chen
Thank
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