What are common urine findings in post renal diseases?

In post-renal diseases, which typically arise from obstruction in the urinary tract leading to back pressure on the kidneys, it is common to find red blood cells (RBCs), white blood cells (WBCs), and crystals in the urine. The presence of RBCs can indicate injury or irritation in the urinary tract, potentially due to stones or other obstructive processes. WBCs are often present due to associated infections or inflammation that can occur when the flow of urine is disrupted. Crystals may also be found as a result of changes in urine composition that occur when urine becomes concentrated or stagnant due to obstruction.

This combination of findings effectively reflects the pathology associated with post-renal issues, particularly due to irritation or injury in the urinary system. As such, the presence of RBCs, WBCs, and crystals in the urine serves as an important diagnostic indicator of underlying post-renal dysfunction. Other findings, such as increased sodium or hyaline casts, while possibly indicative of other conditions, do not specifically reflect the typical urine characteristics associated with post-renal diseases. Similarly, while proteinuria can be present in various renal conditions, it is not a primary finding tied specifically to post-renal obstruction.