What percent hemolysis corresponds to gross hemolysis?

• A. 1%
• B. 3%
• C. 30%
• D. 50%

Answer: (C)

Gross hemolysis is when red blood cell rupture is obvious in the plasma or serum, producing a visible pink to red color. This level of lysis means a substantial amount of hemoglobin has been released into the plasma. A commonly used approximate threshold is about 30% of red cells lysed. Below this, the color change may be faint or not visible, while higher levels can be even more pronounced but are not needed to define gross hemolysis. So, the percent hemolysis that corresponds to gross hemolysis is roughly 30%.