Which statement is a sign of hemolysis in the dialysis circuit?

• A. Cranberry juice colored blood in the venous line
• B. Dizziness
• C. Clear dialysate
• D. Low potassium

Answer: (A)

Hemolysis in the dialysis circuit means red blood cells are being destroyed as they pass through the machines. The clearest sign seen by clinicians is a discoloration of the blood in the venous line, often described as cranberry juice–colored blood, which comes from free hemoglobin circulating in the plasma after the cells rupture. This visible color change is a direct clue that mechanical damage to red cells is occurring in the circuit. Other options aren’t specific to hemolysis: dizziness can result from many dialysis-related factors, clear dialysate simply indicates the dialysate isn’t contaminated, and low potassium reflects electrolyte management rather than red cell destruction. If cranberry-colored blood is observed, stop the dialysis promptly and inspect the circuit for issues such as damaged components, kinks, or excessive shear forces, and alert the clinician.