CPT® Code 85055

The reticulated platelet assay, identified by CPT® Code 85055, is a specialized laboratory test designed to assess the activity of reticulated platelets, which are immature platelets newly formed in the bone marrow. Platelets play a crucial role in hemostasis, as they are responsible for binding together to form clots in response to vascular injury. The production of platelets occurs in the bone marrow, and the presence of reticulated platelets indicates ongoing thrombopoiesis, or platelet production. This assay is particularly valuable in the context of thrombocytopenia, a condition characterized by a low platelet count that can lead to severe bleeding complications. Traditional diagnostic approaches to investigate the underlying causes of thrombocytopenia often necessitate invasive procedures, such as bone marrow biopsies, which can be uncomfortable for patients. In contrast, the reticulated platelet assay offers a less invasive alternative, providing insights into the rate of platelet production without the need for such procedures. The assay measures the immature platelet fraction (IPF), which can vary depending on the underlying cause of thrombocytopenia. For instance, a low IPF ratio may indicate suppressed platelet production, such as that seen in patients undergoing chemotherapy, while an elevated IPF ratio may suggest platelet destruction, as observed in conditions like idiopathic thrombocytopenic purpura (ITP). Additionally, the reticulated platelet assay can be instrumental in predicting platelet recovery following hematopoietic progenitor cell (HPC) transplantation, with persistent low IPF levels potentially signaling a failure in the recovery of platelet production.