What happens to urine output in acute glomerulonephritis?

In acute glomerulonephritis, urine output is often decreased, a condition known as oliguria. This occurs due to inflammation and damage to the glomeruli, which impairs their ability to filter blood effectively. As a result, the kidneys may retain water and electrolytes, leading to fluid retention and potentially contributing to edema and hypertension. In some cases, urine may also appear dark or smoky due to the presence of blood and protein.