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Related Concept Videos

Serum Studies: Renal Function Tests01:24

Serum Studies: Renal Function Tests

Renal function tests are crucial for assessing kidney health, monitoring disease progression, and evaluating the kidneys' efficiency in waste elimination, fluid balance, and electrolyte regulation. These tests offer critical insights into kidney function, even though routine measurements may appear normal until there is a significant decline in the glomerular filtration rate or GFR. Typically, signs of kidney impairment only become evident when the GFR falls to about 50% of its normal level.
Effect of Hepatic Disease on Pharmacokinetics: Pathophysiologic Assessment and Liver Function Test01:22

Effect of Hepatic Disease on Pharmacokinetics: Pathophysiologic Assessment and Liver Function Test

In clinical practice, the direct measurement of hepatic blood flow to evaluate liver function presents significant challenges due to the intricate and specialized nature of the necessary techniques. Consequently, healthcare professionals often rely on empirical estimates derived from thorough patient examinations and liver function tests to gauge liver health. Among the tools at their disposal, the Child–Pugh and MELD scoring systems stand out for their ability to categorize and assess the...
Acute Kidney Injury IV: Diagnostic Studies and Prevention01:30

Acute Kidney Injury IV: Diagnostic Studies and Prevention

Accurate diagnosis and effective prevention are critical in managing Acute Kidney Injury (AKI), which is linked to high mortality rates ranging from 10% to 80%. Timely recognition of at-risk patients and careful monitoring can significantly reduce the likelihood of kidney damage.Diagnostic Assessments:The diagnostic process starts with a comprehensive medical history to identify prerenal, intrarenal, and postrenal causes.Prerenal causes, such as dehydration, hypotension, or blood loss, should...
Renal Drug Excretion: Effect of Urine pH, Flow Rate, and Drug pKa01:22

Renal Drug Excretion: Effect of Urine pH, Flow Rate, and Drug pKa

The pH of urine, the drug's pKa, and the urine flow rate are vital parameters for drug reabsorption and excretion. Urinary pH varies between 4.6 and 8.0 and is influenced by diet, drug intake, and the patient's pathophysiology. It affects a drug's ionization state and reabsorption. For instance, carbohydrate-rich food produces alkaline urine promoting drug excretion, while proteins and certain medications like ascorbic acid lead to acidic urine enhancing reabsorption.
The pKa of a drug,...
Renal Regulation of Acid-Base Balance01:29

Renal Regulation of Acid-Base Balance

Metabolic reactions in the body produce nonvolatile acids, such as sulfuric acid, which generate an acid load of approximately 1 mEq of H+ per kilogram of body weight daily. Excreting H+ in the urine is essential to balance this acid load.
In the kidneys, cells within the proximal convoluted tubules (PCT) and the collecting ducts secrete hydrogen ions (H+) into the tubular fluid. Specifically, in the PCT, Na+/H+ antiporters secrete H+ while reabsorbing Na+.
However, the intercalated cells in...
Urea Cycle01:23

Urea Cycle

The urea cycle describes how liver cells convert ammonia to urea. Ammonia is a toxic waste product of protein catabolism. Land animals must convert ammonia into the less toxic urea which can be safely eliminated by the kidneys through urine. Marine animals excrete ammonia directly, and the surrounding water dilutes the ammonia to safe levels.

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Related Experiment Video

Updated: May 25, 2026

Transcutaneous Assessment of Renal Function in Conscious Rodents
07:18

Transcutaneous Assessment of Renal Function in Conscious Rodents

Published on: March 26, 2016

Is blood ammonia influenced by kidney function? A prospective study.

Muhammad Imran1, Yaser Shah, Seema Nundlall

  • 1Department of Nephrology, Royal Liverpool and Broadgreen University Hospital NHS Trust, Liverpool, UK.

Clinical Biochemistry
|January 14, 2012
PubMed
Summary

Blood ammonia levels do not increase with worsening chronic kidney disease (CKD). This study found no correlation between ammonia and CKD severity, regardless of dialysis status.

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Transcutaneous Assessment of Renal Function in Conscious Rodents
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A Large Animal Model for Acute Kidney Injury by Temporary Bilateral Renal Artery Occlusion
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Published on: February 2, 2021

Area of Science:

  • Nephrology
  • Clinical Chemistry
  • Biochemistry

Background:

  • Chronic kidney disease (CKD) is a global health concern.
  • The role of blood ammonia in CKD progression is not fully understood.
  • Investigating ammonia levels in CKD patients is crucial for understanding disease pathophysiology.

Purpose of the Study:

  • To determine if blood ammonia levels are elevated in patients with chronic kidney disease (CKD).
  • To investigate the relationship between ammonia concentrations and the severity of CKD.
  • To assess the impact of dialysis on ammonia levels in CKD patients.

Main Methods:

  • Fifty-eight subjects with varying stages of CKD were enrolled.
  • Plasma ammonia and electrolyte levels were analyzed.
  • Correlation analysis was performed to assess the relationship between ammonia and CKD severity.

Main Results:

  • All measured plasma ammonia concentrations were within the normal reference range.
  • No significant correlation was found between ammonia levels and CKD severity.
  • Dialysis status did not affect ammonia concentrations.

Conclusions:

  • Blood ammonia is not elevated in patients with chronic kidney disease.
  • Ammonia levels are not related to the severity of CKD.
  • These findings suggest ammonia is not a key biomarker for CKD progression.