Myelocytes are immature white blood cells that normally develop in the bone marrow. If they're found in high numbers in the blood, it may suggest a problem like an infection, inflammation, or a bone marrow disorder, including certain types of leukemia. By assessing the percentage of myelocytes, doctors can help diagnose these conditions, monitor the progression of known diseases, or see how well a treatment is working. This test provides crucial information about the health of the bone marrow and the body's ability to fight infections.