🧪 Diagnosis

Diagnosing leukemia involves a systematic, multi-step clinical process. Because leukemia symptoms are often non-specific, the diagnostic journey typically begins when a routine or symptom-driven blood test reveals abnormalities that prompt further investigation.

Initial Blood Tests

A Complete Blood Count (CBC) with differential is the critical first step. Leukemia may show an elevated, normal, or even low total white blood cell count depending on the type. The differential reveals the proportions of cell types, and abnormal blast counts or extreme values raise immediate suspicion. A peripheral blood smear allows visual examination of cell morphology.

Bone Marrow Biopsy

The gold standard for leukemia diagnosis is a bone marrow aspiration and biopsy, typically performed at the posterior iliac crest. The sample undergoes morphological examination, flow cytometric immunophenotyping (identifying cell surface markers), cytogenetic analysis (chromosomal karyotyping), FISH (Fluorescence In Situ Hybridization for specific chromosomal abnormalities), and molecular testing (PCR for specific gene fusions or mutations).

Additional Diagnostic Tests

Lumbar puncture (spinal tap) is performed in ALL to assess central nervous system involvement. CT or PET scans evaluate lymph node and organ involvement. Echocardiogram may be ordered before certain cardiotoxic chemotherapy regimens.

Seeking Answers

If you have received an abnormal blood test result or are concerned about potential leukemia symptoms, the next step is to consult a primary care physician who can order appropriate tests and, if needed, refer you to a hematologist or oncologist.