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Related Concept Videos

Regulation of Sodium and Potassium01:26

Regulation of Sodium and Potassium

The regulation of sodium and potassium ion concentrations in the human body is a complex process governed primarily by hormones such as aldosterone, antidiuretic hormone (ADH), and atrial natriuretic peptide (ANP).
Sodium Regulation
Sodium ions make up approximately 90% of extracellular cations, with a normal blood plasma concentration of 136–148 mEq/L. A decrease in blood volume and pressure triggers the release of renin from granular cells in the juxtaglomerular complex (JGC), primarily in...
One-Compartment Open Model: Urinary Excretion Data and Determination of k01:11

One-Compartment Open Model: Urinary Excretion Data and Determination of k

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 be...
Drug Dosing in Renal Diseases: Measurement of Serum Creatinine Concentration and Clearance01:25

Drug Dosing in Renal Diseases: Measurement of Serum Creatinine Concentration and Clearance

In healthy individuals, serum creatinine levels remain stable due to a balance between its constant production—primarily from muscle metabolism—and renal excretion. Creatinine is freely filtered by the glomeruli, making it a valuable marker for estimating renal function. When the glomerular filtration rate (GFR) decreases, the kidneys can only eliminate less creatinine, causing serum levels to rise.Serum creatinine concentration is widely used to estimate creatinine clearance (Clcr), a...
Drug Dosing in Renal Diseases: Estimation of Glomerular Filtration Rate Based on Serum Creatinine Concentration01:28

Drug Dosing in Renal Diseases: Estimation of Glomerular Filtration Rate Based on Serum Creatinine Concentration

Glomerular filtration rate (GFR) can be estimated from serum creatinine using the modification of diet in renal disease (MDRD) formula or the chronic kidney disease–epidemiology collaboration (CKD–EPI) equation. Both methods are widely used in clinical practice to assess kidney function and guide treatment decisions.The MDRD equation does not require weight or height measurements and is normalized to the body surface area of 1.73 m², considered the average adult surface area. This equation is...
Drug Dosing in Renal Diseases: Dose Adjustments Based on Drug Clearance and Elimination Rate Constant01:25

Drug Dosing in Renal Diseases: Dose Adjustments Based on Drug Clearance and Elimination Rate Constant

In patients with renal disease, dosage adjustments are necessary to maintain therapeutic plasma drug concentrations and prevent toxicity or subtherapeutic exposure. Renal impairment alters drug pharmacokinetics, especially in conditions like uremia, where changes such as prolonged elimination half-life and altered apparent volume of distribution can significantly affect drug disposition. These changes require careful modification of the dosing regimen to achieve the desired clinical...
Physiology of the Genitourinary System II: Tubular Reabsorption and Secretion01:22

Physiology of the Genitourinary System II: Tubular Reabsorption and Secretion

The kidneys maintain homeostasis through filtration, reabsorption, and secretion. Tubular reabsorption and secretion are crucial in forming urine and regulating electrolytes, water balance, and waste elimination.Tubular Reabsorption and Secretion ProcessesTubular reabsorption is the process that reclaims essential substances such as electrolytes, glucose, amino acids, and water from the glomerular filtrate back into the bloodstream. This is achieved through passive and active transport...

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Updated: Jul 1, 2026

5/6th Nephrectomy in Combination with High Salt Diet and Nitric Oxide Synthase Inhibition to Induce Chronic Kidney Disease in the Lewis Rat
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K-SALT Equation for Urinary Sodium Estimation in CKD.

Semin Cho1, Hayne Cho Park2, Woo Yeong Park3

  • 1Department of Internal Medicine, Chung-Ang University Gwangmyeong Hospital, Gyeonggi, Republic of Korea.

Kidney International Reports
|June 30, 2026
PubMed
Summary

The new Korean Sodium Assessment Tool (K-SALT) accurately estimates 24-hour urinary sodium (24 hUNa) excretion in Korean patients with chronic kidney disease (CKD). This tool improves sodium intake assessment and dietary management for this population.

Keywords:
24-hour urine sodiumchronic kidney diseasesalt intakespot urine sodium

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Published on: February 9, 2021

Area of Science:

  • Nephrology
  • Clinical Nutrition
  • Biostatistics

Background:

  • Accurate 24-hour urinary sodium (24 hUNa) excretion estimation is crucial for managing chronic kidney disease (CKD).
  • Existing estimation equations lack validity in Korean populations.
  • A population-specific tool is needed for Korean CKD patients.

Purpose of the Study:

  • To develop and validate the Korean Sodium Assessment Tool (K-SALT).
  • To create an equation for estimating 24 hUNa from spot urine in Korean CKD patients.

Main Methods:

  • Hybrid cohort design with prospective and retrospective data from 16 Korean hospitals.
  • Multiple regression models using demographic, anthropometric, and spot urine data.
  • Performance comparison with existing equations using ICC, mean bias, and AUC.

Main Results:

  • The K-SALT equation showed superior performance compared to existing formulas.
  • K-SALT achieved higher ICC and AUC values with lower prediction error.
  • External validation confirmed K-SALT's robustness across CKD stages.

Conclusions:

  • K-SALT is the first large-scale, population-specific equation for estimating 24 hUNa in Korean CKD patients.
  • K-SALT enables more accurate sodium intake assessment.
  • The tool supports individualized dietary sodium management in CKD care.