Papanicolaou EA50 Stain Solution

The Papanicolaou stain is the established standard in cytology. Originally developed to evaluate estrogen levels in vaginal epithelium and to detect pathogens such as Candida and Trichomonas in the genital tract, this method combines Orange G6 with either EA36 or EA50. This formulation produces vivid green, blue, and pink cytoplasmic staining. Key features include bright, transparent cytoplasm and sharp visualization of nuclear membranes, nucleoli, and chromatin structures. For exfoliated cell specimens, the Pap stain renders nuclei blue to black, while the cytoplasm of keratinizing squamous cells appears pink to orange-red.

As a variant of the Pap stain, the Papanicolaou EA50 Stain Solution is suitable for both gynecological cytology and non-gynecological samples. It is widely used for cervical cancer screening and the detection of precancerous lesions, as well as for staining body fluids such as pleural effusions, ascites, and sputum specimens.