Affiliation:
1. Clinical Laboratory Service, San Raffaele Hospital , Via Olgettina 60 , 20132 Milan , Italy , Phone: +39 0226432282, Fax: +390226432640
2. Clinical Laboratory Service, San Raffaele Hospital , Milan , Italy
Abstract
Abstract
Background:
Procalcitonin (PCT) is a recognized marker of sepsis, and its use is expanding to antibiotic stewardship. The aim of this study was the evaluation of two methods: Diazyme PCT on Roche Cobas c702 (PCT-D) and BRAHMS PCT on Roche Cobas e602 analyzers (PCT-BR) in comparison with BRAHMS PCT-sensitive Kryptor (PCT-BK).
Methods:
Imprecision was assessed at six critical concentrations following the CLSI EP5-A3; limits of detection (LoDs) were checked according to CLSI EP17-A2; linearity was tested, and method comparison was performed on 239 serum samples.
Results:
Overall CVs ranged from 12.58% to 5.97% for PCT-D, from 3.94% to 1.70% for PCT-BR and from 6.57% to 1.90% for PCT-BK. LoDs were 0.143 μg/L, 0.014 μg/L, 0.040 μg/L for PCT-D, PCT-BR and PCT-BK, respectively. The functional assay sensitivity was 0.24 μg/L for PCT-D, 0.045 μg/L for PCT-BK and <0.035 μg/L for PCT-BR. PCT-BR was linear up to 68.7 μg/L, PCT-BK up to 43 μg/L and PCT-D up to 27.2 μg/L. Method comparison: PCT-D=0.6543 PCT-BK+0.014, r=0.8463 (but 0.44 if calculated on 0–5 μg/L range); PCT-BR=0.9125 PCT-BK+0.021, r=0.9917. Cohen’s κ ranged from 45.2% at 0.25 μg/L to 57.0% at 2.00 μg/L between PCT-D and PCT-BK, whereas it ranged from 89% to 81.3% between PCT-BR and PCT-BK.
Conclusions:
The PCT-D performances were significantly different from those of PCT-BR and PCT-BK regarding sensitivity, precision, linearity and agreement at clinical cutoffs. For some patients with serial testing, significantly deviating results were obtained compared to reference. In contrast to Roche PCT assay, it does not seem feasible to use BRAHMS PCT cutoffs for the Diazyme test.
Subject
Biochemistry, medical,Clinical Biochemistry,General Medicine
Cited by
26 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献