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Drug Dosing in Renal Diseases: Measurement of Glomerular Filtration Rate01:25

Drug Dosing in Renal Diseases: Measurement of Glomerular Filtration Rate

The glomerular filtration rate (GFR) is a critical indicator of kidney health, reflecting how well the kidneys filter blood. Changes in GFR can signal potential kidney impairment, necessitating accurate measurement methods to monitor kidney function effectively.Various molecules can serve as markers for GFR measurement, with the ideal marker meeting several specific criteria. It must freely filter at the glomerulus, avoid reabsorption or secretion by the renal tubules, remain unmetabolized, not...
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...
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.
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.
One condition associated with renal failure is uremia. Uremia is characterized by impaired glomerular filtration and fluid accumulation in the body. This condition hinders the renal clearance of drugs, resulting in drug accumulation and potential...
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...
Renal Clearance01:23

Renal Clearance

The glomerular filtration rate (GFR) is a critical marker of kidney function, reflecting the efficiency of filtration by the glomeruli. Renal clearance of specific substances, such as inulin or creatinine, is commonly used to measure GFR.
Renal clearance refers to the volume of plasma cleared of a specific substance, such as creatinine, per unit of time. To measure clearance, urine samples are collected over a 24-hour period during each bladder voiding, followed by a single blood sample at the...

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Cytosolic Calcium Measurements in Renal Epithelial Cells by Flow Cytometry
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Measuring cystatin C to determine renal function in neonates.

Yogavijayan Kandasamy1, Roger Smith, Ian M R Wright

  • 1Department of Neonatology, The Townsville Hospital, Queensland, Australia. Yoga_Kandasamy@health.qld.gov.au

Pediatric Critical Care Medicine : a Journal of the Society of Critical Care Medicine and the World Federation of Pediatric Intensive and Critical Care Societies
|February 9, 2013
PubMed
Summary

Serum cystatin C is a promising marker for diagnosing acute kidney injury in newborns. While levels vary with age, they can indicate kidney problems in sick infants.

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Area of Science:

  • Neonatal Medicine
  • Nephrology
  • Biomarkers

Background:

  • Acute kidney injury (AKI) in neonates has a high mortality rate.
  • Early and accurate diagnosis of AKI in neonates is crucial for improving outcomes.

Purpose of the Study:

  • To assess the feasibility of using serum cystatin C measurements for early AKI diagnosis in neonates.
  • To review existing literature on cystatin C levels in neonatal populations.

Main Methods:

  • Searched PubMed and Cochrane Database for studies on cystatin C in neonates (1990-2012).
  • Included studies with neonatal populations published in English.
  • Analyzed data from ten studies measuring serum cystatin C in neonates.

Main Results:

  • Neonatal cystatin C levels are highest at birth (1-2 mg/L) and decrease over the first year.
  • Maternal levels, sex, and gestational age do not significantly influence neonatal cystatin C.
  • Elevated cystatin C levels were observed in neonates with sepsis, AKI, and congenital renal abnormalities.

Conclusions:

  • Serum cystatin C shows potential as an ideal marker for neonatal renal function.
  • It can establish baseline renal function and aid in monitoring sick neonates.
  • Further research is needed to validate cystatin C in sick neonates and correlate levels with outcomes.