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Updated: Jul 9, 2026
A High-throughput Method for Measurement of Glomerular Filtration Rate in Conscious Mice
Published on: May 10, 2013
Hoek's formula, a cystatin C-based prediction formula for determining the glomerular filtration rate, is the most
Insights
Hoek's formula, utilizing serum cystatin C, most accurately predicts vancomycin levels for kidney drug dosing. This research aids in optimizing initial vancomycin dosage settings for improved patient care.
Area of Science:
- Pharmacokinetics and Pharmacodynamics
- Nephrology
- Clinical Chemistry
Background:
- Serum cystatin C is increasingly used to estimate glomerular filtration rate (GFR).
- Existing formulas for GFR estimation using cystatin C have not been validated for drug dosage adjustments.
- Accurate GFR estimation is crucial for optimizing doses of renally cleared medications like vancomycin.
Purpose of the Study:
- To compare the predictive performance of various serum cystatin C-based formulas for estimating vancomycin trough concentrations.
- To identify the most accurate cystatin C-based formula for guiding initial vancomycin dosage adjustments.
Main Methods:
- Retrospective analysis of data from 158 hospitalized patients.
- Utilized five published serum cystatin C-based formulas, categorized by inclusion/exclusion of anthropometric data.
- Predicted serum vancomycin trough concentrations using VCM-TDM S_edition ver. 1.00 software.
Main Results:
- Hoek's formula (with anthropometric data) demonstrated the lowest mean absolute error (MAE) of 2.38 for predicting vancomycin levels.
- Other formulas showed higher MAEs, including Grubb's 1 (4.13), Sjöström's (2.90), Cockcroft and Gault (4.42), Larsson's (3.07), and Grubb's 2 (3.63).
Conclusions:
- Hoek's formula is the most effective among the evaluated cystatin C-based methods for predicting vancomycin trough concentrations.
- This finding supports the use of Hoek's formula for optimizing initial vancomycin dosage regimens in patients with varying kidney function.
Objective:
Some formulas using the serum cystatin C level to estimate the GFR have recently been reported. However, there has been no report of a serum cystatin C-based formula for adjusting the dosage of the drugs cleared by the kidney. In this study, we compared the predictive performance of the serum vancomycin trough concentration predicted using serum cystatin C-based formulas.
Method:
The data were collected from 158 hospitalized patients. Five formulas have been published to predict the GFR using serum cystatin C. The cystatin C-based formulas were divided into two groups, formulas with or without anthropometric data. We predicted the serum vancomycin trough concentrations using VCM-TDM S_edition ver. 1.00 software.
Results:
In formulas with anthropometric data, the mean absolute error (MAE) using Hoek's formula was 2.38, the MAE using Grubb's 1 formula was 4.13, the MAE using Sjöström's formula was 2.90, and the MAE using Cockcroft and Gault formula based on creatinine was 4.42. On the other hand, in formulas without an anthropometric data group, the MAE using Larsson's formula was 3.07, and the MAE using Grubb's 2 formula was 3.63.
Conclusion:
These results suggested that Hoek's formula is the most useful formula for determining the initial dosage settings for vancomycin.
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