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Measurement of urin...
Measurement of urinary cystatin C with a particle-enhanced turbidimetric immunoassay on architect ci8200
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- Noraddin, Feria Hikmet (author)
- Uppsala universitet,Biokemisk struktur och funktion,Klinisk kemi
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- Flodin, Mats (author)
- Uppsala universitet,Biokemisk struktur och funktion,Klinisk kemi
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- Fredricsson, Annika (author)
- Uppsala universitet,Biokemisk struktur och funktion,Klinisk kemi
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- Sohrabian, Azita (author)
- Uppsala universitet,Biokemisk struktur och funktion,Klinisk kemi
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- Larsson, Anders (author)
- Uppsala universitet,Biokemisk struktur och funktion,Klinisk kemi
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(creator_code:org_t)
- 2012-09-21
- 2012
- English.
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In: Journal of clinical laboratory analysis (Print). - : Wiley. - 0887-8013 .- 1098-2825. ; 26:5, s. 358-364
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https://europepmc.or...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
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- 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 R(2) = 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.
Subject headings
- MEDICIN OCH HÄLSOVETENSKAP -- Klinisk medicin -- Urologi och njurmedicin (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Clinical Medicine -- Urology and Nephrology (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
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