👉 Midnight fluid, also known as urofluorescein or MIF, is a water-soluble dye used in urography (kidney imaging) to highlight the urinary tract. When administered, it emits a faint blue fluorescence under ultraviolet light, making it visible on X-ray images of the kidneys, ureters, and bladder. This fluorescence helps in identifying abnormalities such as stones, tumors, or blockages by delineating the urinary tract's structure and any irregularities. The term "midnight" refers to its peak visibility during nighttime imaging, when the contrast between normal and abnormal tissues is most pronounced.
