Chronic lymphocytic leukemia (CLL) is a malignant blood disorder in which there are an increased number of white blood cells in the lymphoid tissue. In CLL, the abnormal lymphocytes, also called leukemic cells, are produced instead of healthy white blood cells, and then accumulate over time.
People with CLL may have very high white blood cell counts because of excess numbers of lymphocytes (lymphocytosis), but the leukemia cells don't fight infection the way normal white blood cells do.
At the time of diagnosis, patients can have very, very high white blood cell counts. Typically a healthy person has a white blood cell count of about 4,000-11,000. Patients with acute or even chronic leukemia may come in with a white blood cell count up into the 100,000-400,000 range.
Leukemia, a type of cancer found in your blood and bone marrow, is caused by the rapid production of abnormal white blood cells. The high number of abnormal white blood cells are not able to fight infection, and they impair the ability of the bone marrow to produce red blood cells and platelets.
Many signs and symptoms of AML are the result of a shortage of normal blood cells, which happens when the leukemia cells crowd out the normal blood-making cells in the bone marrow. As a result, people don't have enough normal red blood cells, white blood cells, and blood platelets.
The slow-growing form of chronic lymphocytic leukemia (CLL) is the least serious type of leukemia. It is a disease of older people; the average age at diagnosis is around 71. CLL is a malignancy of mature lymphocytes, which usually grow and divide slowly, resulting in a slowly progressive disease.
If you have leukemia, you'll likely have higher than normal counts of white blood cells.
Overall, the most common cause for a high white blood cell count is response to infection. Another potential cause of an elevated white blood cell count is leukemia. This is effectively a cancerous change of the blood and bone marrow which causes significant overproduction of white blood cells.
Your doctor will conduct a complete blood count (CBC) to determine if you have leukemia. This test may reveal if you have leukemic cells. Abnormal levels of white blood cells and abnormally low red blood cell or platelet counts can also indicate leukemia.
A person with cancer can develop a low WBC count from the cancer or from treatment for the cancer. Cancer may be in the bone marrow, causing fewer neutrophils to be made. The WBC count can also go down when cancer is treated with chemotherapy drugs, which slow bone marrow production of healthy WBCs.
While having an elevated or abnormally high white blood cell count does not necessarily indicate leukemia, the source of the condition will need to be identified if it is found to exceed the levels and duration of a normal immune response to an infection.
Certain types of cancer, including lymphoma, may lead to an abnormally high white blood cell count. A high WBC count, also known as lymphocytic leukocytosis, can also indicate an existing infection or dysfunction in the immune system.
Acute myeloid (or myelogenous) leukemia (AML) Chronic myeloid (or myelogenous) leukemia (CML) Acute lymphocytic (or lymphoblastic) leukemia (ALL) Chronic lymphocytic leukemia (CLL)
People with AML often have a high number of white blood cells, but most of these are leukemia (blast) cells that do not protect against infection. They may also have a low number of red blood cells and platelets.
Leukemia is most often diagnosed through a diagnostic test called a complete blood count (CBC). If a patient's CBC shows abnormal levels of white blood cells or abnormally low red blood cells or platelets, he or she has leukemia. The physician will then order a bone marrow biopsy to determine the type of leukemia.
Bone marrow test.
During bone marrow aspiration and biopsy, a needle is used to remove a sample of bone marrow from the hipbone or breastbone. The sample is sent to a lab for testing to look for leukemia cells.
What is Leukemia (Blood Cancer)? Leukemia starts in the soft, inner part of the bones (bone marrow), but often moves quickly into the blood. It can then spread to other parts of the body, such as the lymph nodes, spleen, liver, central nervous system and other organs.
If a person appears pale, has enlarged lymph nodes, swollen gums, an enlarged liver or spleen, significant bruising, bleeding, fever, persistent infections, fatigue, or a small pinpoint rash, the doctor should suspect leukemia. A blood test showing an abnormal white cell count may suggest the diagnosis.
A high white blood cell count may indicate that the immune system is working to destroy an infection. It may also be a sign of physical or emotional stress. People with particular blood cancers may also have high white blood cells counts.
A blood test that shows a WBC count of less than 4,000 per microliter (some labs say less than 4,500) could mean your body may not be able to fight infection the way it should.
If you have leukemia, your blood cells count will likely show higher than usual levels of white blood cells, which include leukemic cells. You may also have lower than usual red blood cell and platelet cell counts.
Having stage IV disease. Having a high white blood cell count (15,000 or higher). Having a low lymphocyte count (below 600 or less than 8% of the white blood cell count).
In CLL, the leukemia cells grow out of control and crowd out normal blood cells. These cells often build up slowly over time. Many people don't have any symptoms for at least a few years. In time, the cells can spread to other parts of the body, including the lymph nodes, liver, and spleen.