WBC count at diagnosis

Source: Childhood Acute Lymphoblastic Leukemia Treatment (PDQ®)–Health Professional Version, National Cancer Institute.

Source updated: April 21, 2025 · Captured 2026-09-09.

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Context: Risk-Based Treatment Assignment / Prognostic Factors Affecting Risk-Based Treatment / Patient and clinical disease characteristics

A WBC count of 50,000/µL is generally used as an operational cut point between better and poorer prognosis,[3] although the relationship between WBC count and prognosis is a continuous function rather than a step function. Patients with B-ALL and high WBC counts at diagnosis have an increased risk of treatment failure compared with patients with low initial WBC counts.[37]

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The median WBC count at diagnosis is much higher for T-ALL (>50,000/µL) than for B-ALL (<10,000/µL), and there is no consistent effect of WBC count at diagnosis on prognosis for T-ALL.[37-46]

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