Negative CD34 is an immunohistochemistry test that can be used to determine whether a tumor is present. Negative CD34 indicates that the likelihood of tumors in the body is low and is a relatively normal phenomenon. CD34 plays an important role in mediating intercellular mucus, CD34 can be involved in hematopoietic stem cell transport, and also has a certain relationship with the inflammatory response and lymphocyte homing. CD34 negative indicates that the test results are normal, the body’s probability of suffering from hematologic diseases or malignant neoplastic diseases is relatively small. If the CD34 test result is positive, it is possible that there is inflammation in a certain part of the body, or that the body is suffering from a certain hematologic disease, such as leukemia, or that it is suffering from a certain malignant neoplastic disease. It is necessary to combine the clinical symptoms to make a preliminary judgment as to which kind of disease is present. Then actively cooperate with the doctor to do further examination, for example, if you suspect that it is a blood system disease, through the blood routine examination, if you suspect that it is leukemia, you need to do bone marrow aspiration examination to confirm whether you are suffering from leukemia and so on. After the diagnosis is confirmed, cooperate with the doctor to do systematic and regular treatment as soon as possible.