6 doctors weighed in:
Would a CBC always show leukemia, if you have leukemia?
6 doctors weighed in

Dr. Martin Rubenstein
Internal Medicine - Hematology & Oncology
2 doctors agree
In brief: Usually.
The cbc, or complete blood count measures the normal cellular components of blood, red cells, white cells and platelets.
Leukemia is detected by either there being abnormal cells in the blood, or a reduction in the normal elements. Very early on in the development of leukemia, there might not be enough damage to the bone marrow for the normal elements to be effected or abnormal cells to be found.

In brief: Usually.
The cbc, or complete blood count measures the normal cellular components of blood, red cells, white cells and platelets.
Leukemia is detected by either there being abnormal cells in the blood, or a reduction in the normal elements. Very early on in the development of leukemia, there might not be enough damage to the bone marrow for the normal elements to be effected or abnormal cells to be found.
Dr. Martin Rubenstein
Dr. Martin Rubenstein
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Dr. Liawaty Ho
Internal Medicine - Hematology & Oncology
1 doctor agrees
In brief: Not always
Yes, in acute leukemia - you could see immature cancerous cells- called- blasts on the WBC differentials/ peripheral blood smears.
In chronic leukemia however- you could not see the cancer cells you could see some abnormal changes there in CBC and these would raise your suspicion towards possibility of chronic leukemia-(cll/cml) however other work-up would need to be done to establish a diagnosis.

In brief: Not always
Yes, in acute leukemia - you could see immature cancerous cells- called- blasts on the WBC differentials/ peripheral blood smears.
In chronic leukemia however- you could not see the cancer cells you could see some abnormal changes there in CBC and these would raise your suspicion towards possibility of chronic leukemia-(cll/cml) however other work-up would need to be done to establish a diagnosis.
Dr. Liawaty Ho
Dr. Liawaty Ho
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Dr. Sameer Desai
Internal Medicine - Hematology & Oncology
1 doctor agrees
In brief: No
The CBC only shows the total number of white blood cells, red blood cells and platelets.
In order to diagnose leukemia, one must look under the microscope at many characteristics of the blood cells. Usually this requires a test called a bone marrow biopsy.

In brief: No
The CBC only shows the total number of white blood cells, red blood cells and platelets.
In order to diagnose leukemia, one must look under the microscope at many characteristics of the blood cells. Usually this requires a test called a bone marrow biopsy.
Dr. Sameer Desai
Dr. Sameer Desai
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