CPT® Code 85046

Blood count; reticulocytes, automated, including 1 or more cellular parameters (eg, reticulocyte hemoglobin content [CHr], immature reticulocyte fraction [IRF], reticulocyte volume [MRV], RNA content), direct measurement

An automated reticulocyte count is a laboratory test that measures the number of reticulocytes, which are immature red blood cells (RBCs) that are newly released from the bone marrow into the bloodstream. These reticulocytes typically circulate in the peripheral blood for a short duration of 1 to 2 days before maturing into fully developed RBCs. The reticulocyte count is particularly useful in assessing the bone marrow's response to the body's demand for red blood cells, especially in situations where there is a decrease in the overall RBC count, hemoglobin, or hematocrit levels. This test can provide critical insights into various medical conditions, including anemia, where the body may require an increased production of RBCs. The automated reticulocyte count is performed using advanced blood cell counting instruments that can provide precise measurements of reticulocytes along with additional cellular parameters. These parameters may include reticulocyte hemoglobin content (CHr), immature reticulocyte fraction (IRF), mean reticulocyte volume (MRV), and RNA content, all of which contribute to a comprehensive understanding of the reticulocyte population and their functionality. The CHr measurement indicates the amount of hemoglobin present in reticulocytes, serving as a marker for iron utilization in RBC production, which is essential for diagnosing conditions like iron deficiency anemia. The IRF helps in assessing whether reticulocytes are being released prematurely, which can occur in various clinical scenarios such as chronic kidney disease, following chemotherapy, or in patients with certain malignancies. The MRV provides information on the volume of reticulocytes relative to the total RBC count, aiding in the evaluation of iron utilization. Lastly, the RNA content analysis helps determine the maturity level of circulating reticulocytes, offering further insights into the bone marrow's activity and the overall health of the hematologic system.