When a bone marrow aspirate, a CSF sample, a CBC pre-operative, and an ESR for a child in the ED are received together, what is the correct order to process?

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When multiple specimens arrive together, the processing order should protect samples most prone to rapid deterioration. Cerebrospinal fluid is the most time‑sensitive because cellular elements in CSF degrade quickly and morphology and cell counts can change within a short time, which would compromise cytology results. Bone marrow aspirate is also highly time‑sensitive for accurate cytology and downstream tests like flow cytometry, so it should be processed next to preserve cellular detail and yield.

Erythrocyte sedimentation rate depends on properly anticoagulated blood and can tolerate a short delay, so it’s performed after the fragile cytology samples. A CBC from EDTA blood is reliable only within a broader window and can be run after the others when necessary, making it the last to be processed among these specimens.