Related Experiment Video

Updated: Jun 21, 2026

Estimation of Urinary Nanocrystals in Humans using Calcium Fluorophore Labeling and Nanoparticle Tracking Analysis
07:45

Estimation of Urinary Nanocrystals in Humans using Calcium Fluorophore Labeling and Nanoparticle Tracking Analysis

Published on: February 9, 2021

The association of clinical findings and exposure profiles with melamine associated nephrolithiasis

I J Wang1, Y N Wu, W C Wu

  • 1Department of Pediatrics,Taipei Hospital, Taipei, Taiwan.

Archives of Disease in Childhood
|July 18, 2009
PubMed

Insights

High melamine exposure in children significantly increases the risk of developing kidney stones (nephrolithiasis). The risk is linked to how long contaminated products are consumed and the estimated melamine levels, with urine melamine potentially serving as a biomarker.

Area of Science:

  • Pediatric Nephrology
  • Environmental Health
  • Toxicology

Background:

  • Limited data exists on melamine exposure profiles in children.
  • Investigating the link between clinical findings, exposure patterns, and biomarkers for nephrolithiasis in children exposed to melamine.

Purpose of the Study:

  • To evaluate the association between melamine exposure and nephrolithiasis in children.
  • To identify risk factors and potential biomarkers for melamine-induced kidney stones.

Main Methods:

  • A case-control study involving children aged 0-16 years with potential exposure to melamine-contaminated dairy products.
  • Classification into high exposure (>2.5 ppm), low exposure (0.05-2.5 ppm), and control (<0.05 ppm) groups based on estimated melamine levels.
  • Urine melamine levels were measured in cases (nephrolithiasis) and controls.

Main Results:

  • Longer consumption of contaminated products was observed in the high exposure group with nephrolithiasis.
  • High melamine exposure significantly correlated with increased risk of nephrolithiasis (OR 61.04).
  • Risk of nephrolithiasis increased with estimated melamine exposure levels (p for trend <0.001).

Conclusions:

  • Melamine-associated nephrolithiasis risk is associated with consumption duration and exposure levels.
  • Urine melamine, while not highly sensitive, may function as an exposure biomarker for melamine-associated nephrolithiasis.
Abstract

Related Concept Videos

Urinary Tract Calculi II: Pathophysiology and Clinical Manifestations01:26

Urinary Tract Calculi II: Pathophysiology and Clinical Manifestations

Renal calculi, commonly termed kidney stones, are crystalline solid masses that form in the kidneys but can occur at any point within the urinary system, encompassing the kidneys, ureters, bladder, and urethra.The pathophysiology of renal stones involves several key factors: supersaturation of the urine with stone-forming constituents, changes in urine pH, a decrease in urine volume, and the presence of substances that promote or inhibit stone formation.Supersaturation of Urine: This is the...
Urinary Tract Calculi I: Introduction01:28

Urinary Tract Calculi I: Introduction

Renal calculi, or kidney stones, are solid deposits of minerals and salts formed inside the kidneys. In medical terminology, "calculus" refers to the stone itself, while "lithiasis" describes the process of stone formation. Depending on their location within the urinary system, these stones may be classified as either urolithiasis, when situated within the urinary tract, or nephrolithiasis, when located within the kidneys. Each term signifies the specific impact of the stone.Predisposition...
Urinary Tract Calculi III: Medical Management01:30

Urinary Tract Calculi III: Medical Management

The diagnosis of renal calculi involves several imaging techniques, including non-contrast CT scans and ultrasound. These methods help visualize kidney stones, assess their size and location, and detect possible obstructions. Additionally, Measuring urine pH is useful for diagnosing specific stone types, such as struvite (alkaline pH) and uric acid stones (acidic pH). Cystine stones are primarily linked to cystinuria, a genetic condition. A urinalysis helps detect blood in the urine (hematuria)...
Urinary Tract Calculi IV: Nutrition Therapy and Prevention01:27

Urinary Tract Calculi IV: Nutrition Therapy and Prevention

Management of renal calculi focuses on effective strategies like tailored nutrition and hydration therapy. Adjusting diet and fluid intake reduces stone formation and recurrence, making these interventions simple yet powerful in kidney stone prevention and management.Understanding Kidney StonesKidney stones form when calcium, oxalate, uric acid, and cystine concentrate and crystallize in urine. Factors contributing to their formation include genetic predisposition, certain medical conditions,...
Nephrotic Syndrome II : Assessment and Medical Management01:26

Nephrotic Syndrome II : Assessment and Medical Management

IntroductionNephrotic syndrome is a kidney disorder marked by excessive protein loss in the urine, leading to various systemic complications. This condition often results from damage to the glomeruli—the kidney's filtering units—causing proteinuria, low blood protein levels, and fluid retention. Understanding the assessment, diagnosis, and management of nephrotic syndrome is essential for effective treatment and prevention of further kidney damage.AssessmentPatient History: Document any history...
Chronic Kidney Disease II: Clinical Manifestations01:24

Chronic Kidney Disease II: Clinical Manifestations

Chronic Kidney Disease (CKD) progressively impairs multiple body systems due to the accumulation of uremic toxins, which disrupt cellular functions across various organs.Neurologic symptomsNeurologic symptoms often arise early in CKD, as uremic toxin buildup drives changes in cognitive and motor functions. Patients frequently experience fatigue, headache, confusion, difficulty concentrating, and, in severe cases, seizures. Peripheral neuropathy commonly manifests as burning sensations in the...