Which of these is a sign of hemolysis in a unit of red blood cells?

The presence of a bright cherry red color is indicative of intact red blood cells, which suggests that hemolysis has not occurred. In cases of hemolysis, red blood cells break down, releasing hemoglobin and causing changes in the color and clarity of the blood component.

When there is hemolysis, the expected observations include a more reddish or pinkish hue due to the release of hemoglobin from the lysed cells, as well as potential turbidity. However, when blood exhibits a bright cherry red appearance, it indicates that red blood cells have maintained their integrity, suggesting they have not undergone hemolysis. This color is a hallmark of healthy, intact red blood cells that retain their normal morphology and functionality.

Other colors and appearances, such as dark brown or cloudy, are more commonly associated with different conditions or states of degradation and do not represent the healthy intact condition of red blood cells.