Occasional naïve cells refer to the occasional naïve cells seen in blood smears. 1. Naïve cells, also known as immature cells, are cells in the early stages of the cell maturation process, such as late juvenile granulocytes and late juvenile erythrocytes, and are seldom seen in normal peripheral blood smears. 2. In inflammatory conditions, the number of peripheral blood leukocytes is insufficient, and immature cells enter the peripheral blood from the bone marrow in advance, so naïve cells can be found in blood smears. Acute leukemia, myelofibrosis, myelodysplastic syndromes, myeloproliferative neoplasms, acute changes in chronic leukemia or relapse of acute leukemia, etc., there will be a significant increase in the number of primitive cells in the blood smear. Occasionally naïve cells are normal physiological phenomenon, the increase of naïve cells in the blood, it is recommended to consult a doctor in a timely manner, with the help of a doctor to clarify the cause of the disease, and targeted treatment or therapy.