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Introduction to Urinary System

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The urinary system consists of two kidneys, two ureters, the urinary bladder, and the urethra.
The kidneys are bean-shaped organs located in the retroperitoneal space, on either side of the vertebral column, between the T12 and L3 vertebrae. They are partially protected by the rib cage and surrounded by perirenal fat, which provides cushioning. They are responsible for urine formation and play critical roles in regulating blood pressure, electrolyte levels, and hormone production. The ureters...

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Urinalysis is a widely used diagnostic test that analyzes urine's physical, chemical, and microscopic characteristics. Healthcare providers use it to detect and monitor various health conditions, including renal disease, urinary tract infections (UTIs), diabetes, and metabolic or systemic disorders.Components of UrinalysisUrinalysis consists of three primary components: physical, chemical, and microscopic examination. Each provides unique insights into the urine sample and, by extension, the...

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Related Experiment Video

Updated: Apr 21, 2026

Proteomic Profile of EPS-Urine through FASP Digestion and Data-Independent Analysis

Published on: May 8, 2021

Variations of human urinary proteome.

¹Lanzhou Institute of Biological Products Co., Ltd., Lanzhou, China, lzcy1@163.com.

Advances in Experimental Medicine and Biology

|October 31, 2014

Summary

This summary is machine-generated.

Urinary protein levels are stable, making them valuable biomarkers for disease detection and physiological changes. Future research should focus on standardizing sample handling and analysis methods for reliable biomarker discovery.

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Last Updated: Apr 21, 2026

Proteomic Profile of EPS-Urine through FASP Digestion and Data-Independent Analysis

Published on: May 8, 2021

A Modified Precipitation Method to Isolate Urinary Exosomes

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Comparative Proteomic Analysis of Whole Kidney, Medulla, and Cortical Tubules in Diabetic Pathogenesis of Kidney Injury in Mice

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Published on: May 2, 2025

Area of Science:

Biochemistry
Proteomics
Clinical Diagnostics

Background:

Dynamic analysis of the human urinary proteome is crucial for identifying disease-specific biomarkers.
Urinary proteins can indicate disease states or normal physiological changes.

Purpose of the Study:

To investigate the stability of urinary protein content.
To establish the potential of stable urinary proteins as reliable biomarkers.

Main Methods:

Analysis of pooled and individual human urine samples using RPLC-MS/MS.
Utilized spectral counting for protein quantification.
Reviewed existing research on urinary proteome studies.

Main Results:

The content of many urinary proteins was found to be relatively stable.
Proteins like prostaglandin-H2 D-isomerase and apolipoprotein D support the hypothesis of stable biomarker candidates.
Findings suggest stable urinary proteins are valuable resources for biomarker discovery.

Conclusions:

Stable urinary proteins represent a valuable resource for biomarker development.
Further studies are needed to standardize urine sample handling, analysis methods, and data processing for robust biomarker identification.