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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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The kidneys concentrate or dilute urine to maintain water and electrolyte balance. Nephrons, particularly the loop of Henle, play a crucial role in this process through the countercurrent multiplication system. This system establishes a high osmolarity in the renal medulla, which is essential for water reabsorption. In the loop of Henle’s descending limb, water is reabsorbed into the surrounding medulla due to its permeability to water. In contrast, the ascending limb actively transports...
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The one-compartment open model leverages urinary excretion data to estimate renal clearance, which gauges the kidney's capacity to expel a drug. This method offers several benefits, including directly measuring drug elimination and assessing the kidney's contribution to overall drug clearance. However, this approach has limitations. It assumes sole renal excretion of the drug, which is not true for all drugs. Accurate urinary excretion and plasma drug concentration measurement can also...
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Related Experiment Video

Updated: Apr 30, 2026

One-step Metabolomics: Carbohydrates, Organic and Amino Acids Quantified in a Single Procedure
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Do not just do it, do it right: urinary metabolomics--establishing clinically relevant baselines.

Drupad K Trivedi1, Ray K Iles

  • 1Eric Leonard Kruse Foundation for Health Research, Manchester, UK; Manchester Institute of Biotechnology and School of Chemistry, University of Manchester, M1 7DN, UK.

Biomedical Chromatography : BMC
|May 3, 2014
PubMed
Summary

Choosing the right analytical techniques is crucial for effective metabolomics. This review suggests optimal methods for urinary metabolomics to ensure reliable data for baseline studies.

Keywords:
chromatographymetabolomicsshotgun analysisurine

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Area of Science:

  • Biochemistry
  • Analytical Chemistry

Background:

  • Metabolomics is increasingly used to study clinical pathologies.
  • Selecting appropriate analytical techniques is vital for maximizing information from biological samples.

Purpose of the Study:

  • To review techniques for metabolomics over the past decade.
  • To suggest an optimal combination of techniques for urinary metabolomics.

Main Methods:

  • Exploration of various separation and detection techniques.
  • Consideration of reverse-phase and normal phase/hydrophilic interaction liquid chromatography.
  • Evaluation of high-resolution mass spectrometry and ion trap mass spectrometry.

Main Results:

  • Different biological samples (serum vs. urine) require different chromatographic approaches.
  • High-resolution mass spectrometry may reduce the need for pre-separation.
  • Ion trap mass spectrometry can be used for concentrating ions of low-abundance analytes.

Conclusions:

  • Optimizing technique combinations is essential for reliable metabolomic data.
  • Specific methods are recommended for urinary metabolomics to address its polar nature.
  • Establishing inherent variability in large control sets is necessary for baseline studies.