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Measurement of urinary cystatin C with a particle-enhanced turbidimetric immunoassay on Architect ci8200.

Posted by on in 2012
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Noraddin FH1Flodin MFredricsson ASohrabian ALarsson A. 2012.

1Department of Medical Sciences, Clinical Chemistry, Uppsala University, Uppsala, Sweden.

Abstract

BACKGROUND:

Cystatin C is a low-molecular-weight protein that is freely filtered by the glomerulus and catabolized after reabsorption by the proximal tubular cells in healthy subjects. Urinary cystatin C is a potential biomarker for tubular damage including acute kidney injury (AKI) in the acute phase when patients are submitted to the intensive care unit.

METHODS:

The aim of this study was to perform a method validation of urinary analysis of cystatin C by particle-enhanced turbidimetric immunoassay (PETIA) on a high-throughput chemical analyzer. Total assay time was 10 min. The antigen excess, linearity, lower limit of quantification (LoQ), recovery, assay precision, stability, and interference caused by hemoglobin were evaluated.

RESULTS:

The LoQ was calculated to 0.020 mg/l with a coefficient of variation (CV) ≤ 10%. No hook effect was observed and the assay was linear over the studied interval less than 0.020-0.950 mg/l with a regression of R² = 0.9994. The assay had a recovery between 93-100% and the assay precision had a total CV of less than 3.5%. Cystatin C was stable for 3 days in room temperature and 14 days in +4C. The assay did not show any major interference with hemoglobin at a hemoglobin concentration of 10 g/L. The reference interval for urine cystatin C was less than 0.166 mg/l.

CONCLUSION:

The urinary cystatin C PETIA showed good precision and performance characteristics including short test turnaround times that are necessary qualifications for a biomarker at a routine laboratory.

© 2012 Wiley Periodicals, Inc.

PMID:
23001981
[PubMed - indexed for MEDLINE]
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