Used to detect presence of bile pigments in urine. Nitric acid added to normal urine (without bile) results in formation of green, blue, violet-red, and yellow-red rings. Bile pigment is present if green and violet-red rings do not form.
InsideSurgery Medical Information Blog
Details of surgical procedures, pathophysiology, signs and symptoms, and treatment of medical diseases,medical and surgical eponyms, and surgeons and surgery in the news