Which test is definitive to diagnose suspected leukemia?

Which test is definitive to diagnose suspected leukemia?

• A. Hemoglobin electrophoresis
• B. Immunoglobulin testing
• C. Complete blood count
• D. Bone marrow biopsy

Answer: (D)

Diagnosing leukemia relies on examining the bone marrow itself. A bone marrow biopsy provides a direct sample of the marrow, showing whether malignant hematopoietic cells are infiltrating the marrow and identifying abnormal blasts. This direct evidence is what confirms leukemia and also allows further classification with advanced testing like flow cytometry and cytogenetics, which guide treatment. A complete blood count can alert you to abnormalities such as anemia, low platelets, or abnormal white cell counts, and it may show blasts in the blood, but it cannot definitively diagnose leukemia because those signs aren’t exclusive to leukemia and can be absent in early disease. Hemoglobin electrophoresis is used to detect abnormal hemoglobins, not malignant blood disorders. Immunoglobulin testing assesses immune function and is not a diagnostic tool for leukemia.

Diagnosing leukemia relies on examining the bone marrow itself. A bone marrow biopsy provides a direct sample of the marrow, showing whether malignant hematopoietic cells are infiltrating the marrow and identifying abnormal blasts. This direct evidence is what confirms leukemia and also allows further classification with advanced testing like flow cytometry and cytogenetics, which guide treatment.

A complete blood count can alert you to abnormalities such as anemia, low platelets, or abnormal white cell counts, and it may show blasts in the blood, but it cannot definitively diagnose leukemia because those signs aren’t exclusive to leukemia and can be absent in early disease. Hemoglobin electrophoresis is used to detect abnormal hemoglobins, not malignant blood disorders. Immunoglobulin testing assesses immune function and is not a diagnostic tool for leukemia.