A CBC flag can be an urgent laboratory problem

An adult K2EDTA specimen was collected at 08:10 and analyzed at 08:42 by an automated impedance and optical fluorescence CBC with differential. White blood cells are 48.6 × 10^9/L, hemoglobin is 8.1 g/dL, and platelets are 24 × 10^9/L against the displayed adult intervals. The analyzer reports BLAST? and immature granulocyte present, which are review triggers rather than a diagnosis.

At 08:55, use a systematic smear scan: assess the film and stain quality, scan the feathered edge and body for distribution, then describe representative abnormal cells. This smear shows many blast-like cells with fine chromatin, prominent nucleoli, moderate basophilic cytoplasm, occasional azurophilic granules, and several needle-like Auer rods. A distinct population of abnormal promyelocyte-like cells has folded or bilobed nuclei, dense coarse azurophilic granules, and occasional bundles of Auer rods. This is an urgent morphology concern, not a diagnosis; obtain the qualified second review or escalation required by the local procedure when the finding is uncertain, discrepant, or independently reviewable.

Acute leukemia can present with circulating blasts plus anemia and thrombocytopenia whether the total leukocyte count is high, normal, or low. For example, a specimen with WBC 5.8 × 10^9/L, hemoglobin 8.1 g/dL, platelets 24 × 10^9/L, and a verified blast-like population still requires the same smear review, disposition, and local urgent-pathway assessment. The released result must be interpreted with its displayed local reference interval and the laboratory's urgent pathway. Treat a blast flag with cytopenias as a smear-review and disposition problem, not an analyzer diagnosis.