"Blood stains" are discolorations or marks on a surface that result from the presence and subsequent drying of blood. When blood is spilled or released from a wound, it can leave behind stains that can be difficult to remove if not treated promptly and properly. Blood stains can occur on various surfaces such as fabric, clothing, upholstery, and hard surfaces like walls, floors, and countertops.

The composition of blood includes several components such as red and white blood cells, plasma, and various proteins, which can affect the appearance and persistence of blood stains. For instance, older or larger blood stains may be more difficult to remove than fresh ones due to the breakdown of hemoglobin in the blood, which can cause it to bind more tightly to fabric fibers.

In forensic science, blood stains are often analyzed for their size, shape, and distribution to help determine the circumstances surrounding a crime or accident. For example, the location and pattern of blood stains can provide valuable information about the position of the victim or perpetrator during an assault or other violent event.

A hospital laundry service is a department or external service that is responsible for the cleaning, disinfection, and maintenance of textiles used within a healthcare facility. This includes items such as bed sheets, patient gowns, scrubs, towels, and other linens. The service ensures that these items are processed and returned in a hygienic and timely manner to maintain a clean and safe environment for both patients and staff. Hospital laundry services must adhere to strict infection control guidelines and use specialized equipment to ensure the removal of potential pathogens and prevent cross-contamination.