Focused instruction

The atlas uses text-labeled panels describing routine, Perls, and supravital teaching findings; it is not a recognition image. It labels routine Wright-Giemsa appearances, Perls-positive iron granules, and supravital-positive Heinz bodies. These text panels do not substitute for patient-image recognition validation.

Supported intracellular material is bounded by the RBC and remains in focus with the cell across fields. Overlays, stain precipitate, and edge debris are look-alikes. Compare a solitary round Howell-Jolly body with clustered peripheral Pappenheimer granules, diffuse stippling, a thread-like Cabot ring, and a dense rectangular Hb C-like crystal; morphology limits remain explicit.

Perls valid-positive control must stain as expected, valid-negative control must remain negative, and an invalid-control outcome invalidates the patient stain. The same control logic applies to supravital stain: valid-positive demonstrates expected inclusion staining, valid-negative has no inappropriate staining, and failed controls invalidate the run pending correction, repeat, or escalation.