A reticulocyte count is a kind of blood test that basically measures how fast reticulocyte (a kind of RBC without a nucleus) is made by the bone marrow and then released into the blood. Reticulocyte are immature RBCs and they are in the blood for two days before developing into a complete or mature RBC. So in other words, a reticulocyte count helps in measuring the number and percentages of new RBC in the body. It is also known as Retic Count, Reticulocyte Percent, Reticulocyte Index, and Corrected Reticulocyte.