Final answer:
Brown-colored urine is a finding associated with glomerulonephritis, as it indicates the presence of blood in the urine (hematuria) due to inflammation of the glomeruli.
Step-by-step explanation:
The finding associated with the diagnosis of glomerulonephritis in a child's health record would be Brown-colored urine. Glomerulonephritis is characterized by inflammation of the glomeruli within the nephrons, often leading to the presence of blood in the urine, a condition known as hematuria. This can result in urine appearing brown or cola-colored. The presence of proteinuria, excessive proteins in the urine, is another symptom of glomerulonephritis, as the damaged glomeruli allow proteins like albumin to pass into the urine.
Additionally, symptoms such as increased blood pressure and fluid retention could be noted, rather than hypotension or a low blood urea nitrogen level.