CPT® Code 85547

The CPT® Code 85547 refers to a laboratory test that evaluates the mechanical fragility of red blood cells (RBCs). This test is crucial for understanding how susceptible RBCs are to hemolysis, which is the process of rupture or destruction of these cells when they are subjected to various forms of stress. Mechanical fragility testing is particularly challenging to standardize due to the complexities involved in simulating the shear stress that RBCs may encounter in clinical settings. Typically, the procedure involves placing a sample of whole blood into a test tube that contains glass beads. The test tube is then vigorously agitated, which mimics the mechanical forces that RBCs might experience during medical procedures. Following this agitation, the sample is analyzed for hemoglobin levels to assess the degree of damage sustained by the RBCs. This test is especially significant in contexts such as dialysis, intra-operative auto-transfusion, and other medical interventions that utilize devices like pumps, valves, cannulas, or gas exchange systems. Additionally, it is important to note that stored blood products can also undergo mechanical stress, leading to potential damage to the RBCs, making this test relevant for ensuring the quality and safety of transfused blood products.