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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...
Factors Affecting Renal Clearance: Renal Impairment01:17

Factors Affecting Renal Clearance: Renal Impairment

Renal dysfunction significantly impairs the renal clearance of drugs, leading to potential complications in drug therapy. Renal failure, which can be caused by various factors, poses a significant challenge in the elimination of drugs from the body.
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Functions of Thyroid Hormones01:18

Functions of Thyroid Hormones

The thyroid hormone (TH) plays a pivotal role in the intricate orchestration of physiological processes, exerting profound effects on development, metabolism, and homeostasis throughout different life stages.
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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 Failure: Dose Adjustments01:11

Renal Failure: Dose Adjustments

In patients with renal impairment, drugs undergo significant changes in their pharmacokinetics, which require dosage adjustments to ensure safe and effective therapy.
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A Versatile, Behavioral Method to Investigate Thyroid Hormone Effects on Cerebellar Function
04:05

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Published on: October 6, 2023

Influence of thyroid function on different kidney function tests.

Martin Kimmel1, Niko Braun, Mark Dominik Alscher

  • 1Division of General Internal Medicine and Nephrology, Department of Internal Medicine, Robert Bosch Hospital, Stuttgart, Germany. martin.kimmel@rbk.de

Kidney & Blood Pressure Research
|August 19, 2011
PubMed
Summary
This summary is machine-generated.

Thyroid dysfunction significantly impacts common kidney function tests. Creatinine-based estimated glomerular filtration rate (eGFR) is recommended over cystatin C, which is unreliable in thyroid disorders.

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Area of Science:

  • Endocrinology
  • Nephrology
  • Clinical Chemistry

Background:

  • Standard kidney function tests have limitations in patients with thyroid dysfunction.
  • Thyroid hormones influence various biomarkers of kidney function.
  • Accurate assessment of kidney function is crucial in managing thyroid disorders.

Purpose of the Study:

  • To evaluate commonly used kidney function tests in patients with hypothyroidism and hyperthyroidism.
  • To assess the impact of thyroid status normalization on these tests.
  • To identify reliable kidney function markers in the presence of thyroid dysfunction.

Main Methods:

  • Prospective case series of 16 patients with thyroid dysfunction.
  • Measurement of serum creatinine, 24-hour creatinine clearance, and calculated/estimated GFR (eGFR) using various formulas (Cockroft-Gault, CKD-EPI).
  • Assessment of serum cystatin C, cystatin C-based eGFR, combined eGFR, and plasma neutrophil gelatinase-associated lipocalin (NGAL) during hypo-, hyper-, and euthyroid states.

Main Results:

  • In hypothyroidism, normalization of free thyroxine (fT(4)) led to decreased creatinine and increased creatinine-based eGFR, while cystatin C increased and its eGFR decreased.
  • In hyperthyroidism, fT(4) normalization resulted in increased creatinine and decreased creatinine-based eGFR, whereas cystatin C decreased and its eGFR increased.
  • Plasma NGAL levels showed no significant changes in either hypo- or hyperthyroidism.

Conclusions:

  • Thyroid function significantly affects most kidney function tests, including creatinine-based and cystatin C-based estimations.
  • Cystatin C is unreliable in thyroid disorders due to significant influence by thyroid status.
  • Creatinine-based eGFR is recommended as the most reliable kidney function test in patients with thyroid dysfunction, while NGAL is unaffected.