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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.
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: 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...
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...
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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Related Experiment Video

Updated: Jul 7, 2026

Observational Study Protocol for Repeated Clinical Examination and Critical Care Ultrasonography Within the Simple Intensive Care Studies
10:38

Observational Study Protocol for Repeated Clinical Examination and Critical Care Ultrasonography Within the Simple Intensive Care Studies

Published on: January 16, 2019

General practitioners' serum creatinine recording styles.

Francesco Del Zotti1, Eugenio Visonà, Dino Massignani

  • 1General Practitioner, Verona - Italy. francesco.delzotti@tin.it

Journal of Nephrology
|February 12, 2008
PubMed
Summary
This summary is machine-generated.

Opportunistic screening for chronic kidney disease using general practitioners' (GPs) serum creatinine records is practical but flawed. Inconsistent data recording, with many results marked "normal" instead of numerical values, hinders effective patient monitoring and disease assessment.

More Related Videos

A High-throughput Method for Measurement of Glomerular Filtration Rate in Conscious Mice
07:07

A High-throughput Method for Measurement of Glomerular Filtration Rate in Conscious Mice

Published on: May 10, 2013

Related Experiment Videos

Last Updated: Jul 7, 2026

Observational Study Protocol for Repeated Clinical Examination and Critical Care Ultrasonography Within the Simple Intensive Care Studies
10:38

Observational Study Protocol for Repeated Clinical Examination and Critical Care Ultrasonography Within the Simple Intensive Care Studies

Published on: January 16, 2019

A High-throughput Method for Measurement of Glomerular Filtration Rate in Conscious Mice
07:07

A High-throughput Method for Measurement of Glomerular Filtration Rate in Conscious Mice

Published on: May 10, 2013

Area of Science:

  • Nephrology
  • Primary Care Medicine
  • Health Informatics

Background:

  • Chronic kidney disease (CKD) screening is crucial for early intervention.
  • General practitioners (GPs) maintain extensive patient databases.
  • Serum creatinine testing is a common diagnostic tool.

Purpose of the Study:

  • To evaluate the consistency and utility of serum creatinine records in primary care databases for opportunistic CKD screening.
  • To assess the feasibility of using routinely collected GP data for epidemiological studies on kidney function.

Main Methods:

  • Retrospective analysis of serum creatinine records from 8 GPs over 36 months.
  • Inclusion of 11,711 adult patients.
  • Examination of data recording practices, including numerical values and qualitative assessments.

Main Results:

  • Over 1 test per patient was ordered on average.
  • Only 27% of tested serum creatinine values were numerically recorded.
  • In 47% of cases, results were qualitatively documented as 'normal', precluding quantitative analysis.

Conclusions:

  • Current data recording practices by GPs are inadequate for effective opportunistic CKD screening.
  • The lack of numerical serum creatinine data impedes glomerular filtration rate estimation and trend analysis.
  • Improved data standardization in primary care is necessary for leveraging electronic health records in CKD surveillance.