Used primarily in clinical and reproductive laboratories to assess sperm morphology in semen analysis. The stain kit rapidly differentiates cellular components, allowing clear visualization of sperm head, midpiece, and tail structures under a microscope. It helps identify abnormal forms such as head defects, cytoplasmic droplets, or tail abnormalities, which are critical in evaluating male fertility. The Diff-Quik method provides quick staining with good contrast, making it suitable for high-volume diagnostic settings. It is commonly used in andrology labs, fertility clinics, and research studies focused on sperm quality and reproductive health.