Technically, how many mL/day is defined as anuria?

Anuria is defined as the absence of urine output or minimal urine output, specifically referring to a condition where the kidneys produce less than 50 mL of urine per day. This measurement is critical in clinical settings as it indicates severe impairment in renal function or complete kidney failure.

While the other options reflect various levels of urine output, they do not align with the clinical definition of anuria. For instance, 0 mL indicates total cessation of urine production, while 100 mL and 200 mL suggest some kidney function remains, albeit diminished. Therefore, the threshold of 50 mL is clinically significant as it marks the line differentiating between anuria and other forms of reduced urine output, leading to targeted treatment approaches.