Parents often ask, “This time, the report of my child’s bone aspiration test says that he has 1% of juvenile lymphocytes, but previously, no juvenile lymphocytes were seen, does this indicate a relapse? Juvenile lymphocytes are short for naive lymphocytes. The juvenile lymphocytes seen under the microscope may be normal juvenile lymphocytes or leukemic juvenile lymphocytes, but it is impossible to distinguish them with the naked eye. Our bone marrow is a hematopoietic factory that needs naive cells. Without naive cells, we cannot proliferate and differentiate into mature red blood cells, white blood cells and platelets. However, the number of infantile cells should not exceed 5%. In infancy, it is possible to have less than 8% infantile cells. In most cases, the small amount of infantile cells seen in the bone marrow during the remission period are normal infantile cells, especially if the child is in good mental condition and has normal blood count, so don’t worry too much. If there are no infantile cells in the bone marrow, the child will become a remittance, and the blood cells will not grow, which is dangerous. In fact, no matter what the test is, I believe that the ultimate goal of parents is to know whether the child’s treatment effect is good or not, so I still have the same old saying: our human body is a living organism, and each person has individual differences, so when analyzing a test result, we must combine it with the child’s specific situation to make the most reasonable analysis.