What term describes the absence of urine?

The term that describes the absence of urine is anuria. Anuria refers to a condition where the kidneys produce little to no urine, often indicating severe kidney dysfunction or failure. This could result from acute kidney injury, chronic kidney disease, or other serious medical conditions. The lack of urine production can have significant implications for fluid and electrolyte balance in the body, making timely medical evaluation essential.

Polyuria, in contrast, denotes an increased volume of urine production, often seen in conditions like diabetes mellitus. Oliguria refers to a reduced volume of urine output but not an absolute absence. Hematuria means the presence of blood in the urine, which is a different condition altogether. These terms each describe different urinary conditions, making anuria the clear definition of absence of urine.