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HelpTest Code LAB6056 Recirculation Studies
Intended Use
Hemodialysis access recirculation can be a cause for inadequate dialysis delivery. Recirculation occurs when dialyzed blood returning through the venous needle re-enters the extracorporeal circuit through the arterial needle, instead of returning to the systemic circulation. Recirculation studies should not be performed for patients dialyzing with a central venous catheter. These studies are for patients with arteriovenous fistulas and also grafts is the provider deems necessary.
Methodology
Photometric/Urease
Performing Laboratory
RCH
Specimen Requirements
Systemic, arterial, and venous blood urea nitrogen specimens are required for this test.
Systemic Blood Urea Nitrogen
Slow the pump speed to 50 mL/min. Draw blood in a gold-top, red-top, or light green-top (lithium heparin) tube(s) from the arterial port. Re-establish the pump speed. Spin down and send 1 mL (minimum volume: 0.1 mL) of serum or lithium heparin plasma refrigerated. Forward promptly.
Note: Label specimen appropriately (systemic and plasma).
Arterial Blood Urea Nitrogen
Re-establish the pump speed. Draw blood in a gold-top, red-top, or light green-top (lithium heparin) tube(s) from the arterial port at the same time as the venous blood urea nitrogen draw. Spin down and send 1 mL (minimum volume: 0.1 mL) of serum or lithium heparin plasma refrigerated. Forward promptly.
Note: Label specimen appropriately (arterial and plasma).
Venous Blood Urea Nitrogen
Re-establish the pump speed. Draw blood in a gold-top, red-top, or light green-top (lithium heparin) tube(s) from the venous port at the same time as the arterial blood urea nitrogen draw. Spin down and send 1 mL (minimum volume: 0.1 mL) of serum or lithium heparin plasma refrigerated. Forward promptly.
Note: Label specimen appropriately (venous and plasma).
Specimen Stability
Ambient: 24 hours
Refrigerated: 4 Days
Frozen (-20ºC): Up to 2 months
Day(s) Test Set Up
Monday through Sunday
Test Classification and CPT Coding
84520 x 3