Which stain is used to prepare smears for viewing reticulocytes on the slide?

• A. Gram stain
• B. Giemsa stain
• C. Modified Wright stain
• D. Wright stain

Answer: (C)

Reticulocytes are young red blood cells that still contain residual RNA. To see the reticular network of this RNA, you need a stain that highlights RNA with a blue color. The Modified Wright stain includes components that stain RNA, making the fine reticular filaments within reticulocytes more visible on the smear. This helps distinguish reticulocytes from mature erythrocytes more clearly than a standard Wright stain, which lacks that extra RNA-staining capability. Gram stain is designed for bacteria and won’t highlight intracellular RNA networks. Giemsa stain provides good overall blood cell detail but doesn’t specifically emphasize the reticular material as effectively as the Modified Wright combination. While a true supravital stain would optimally reveal reticulocytes, among the given options, the Modified Wright stain is best for viewing them on a slide.