Yes, blood tests can show the presence of leukemia, a type of cancer of the blood and bone marrow. A blood test can detect the presence of abnormal white blood cells, which are a characteristic of leukemia. A doctor may order a blood test if they suspect that a patient is suffering from leukemia, especially if they have symptoms such as fatigue, fever, or unexplained weight loss.
The specific type of blood test used to detect leukemia is called a complete blood count (CBC). This test measures the number of red blood cells, white blood cells, and platelets in a sample of blood. It also looks for any abnormal changes in the size and shape of the cells. If the CBC detects an abnormally high number of white blood cells, this may be indicative of leukemia. Depending on the type of leukemia, the number of white blood cells can be significantly elevated.
In addition to the CBC, other blood tests may be ordered to confirm a diagnosis of leukemia. These tests may include a peripheral blood smear, which looks for abnormal white blood cells, and a bone marrow biopsy, which looks for leukemia cells in the marrow.
Overall, blood tests can be used to detect the presence of leukemia, as well as to determine the type of leukemia. Blood tests are just one part of the diagnostic process, and they should be combined with other tests and a physical examination for an accurate diagnosis.