Evaluation of free thyroxine determination based on one-step fluorometric immunoassay technique and the suboptimal concordance with two-step immunoassay.
J Pharm Biomed Anal
; 160: 187-194, 2018 Oct 25.
Article
em En
| MEDLINE
| ID: mdl-30098489
ABSTRACT
Free thyroxine (FT4) quantification is continuing to be a concern. The purpose of the following study was to evaluate the analytical performance of Tosoh AIA900 based on a one-step technique and its comparison to Access 2 (two-step technique) over different clinical contexts (euthyroid, thyroid disorders, uncontrolled diabetes, renal failure and pregnancy). The protocol established by the French society of Clinical Biology was used to evaluate imprecision, limit of detection, trueness, linearity, interferences and method comparisons. Within-run variation of 3.1%, 5.7% and 4.4% were found for the low, medium and high controls, respectively. Between-run was 5.8% for low control, 5.7% for medium control and 7.1% for high control. Common interferences did not affect one-step immunoassay FT4 results. The linearity was checked up to 86â¯pmol/L. The limit of detection was 5.5â¯pmol/L. The concordance correlation coefficient (CCC) showed a low agreement (0.6) between both methods. Bland-Altman plot revealed that AIA 900 one-step immunoassay technique provides a significant higher values ((+2.8⯱â¯2.7â¯pmol/L;pâ¯<â¯0.0001). The Passing-Bablok regression demonstrated both proportional and systematic differences in comparison to Access 2. The lowest association was noted in subjects with impaired renal function (CCCâ¯=â¯0.27). At the time of the study, the results of on-step immunoassay are not directly comparable with Access 2.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Tiroxina
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Imunoensaio
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Estudos de Avaliação como Assunto
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Fluorometria
Tipo de estudo:
Diagnostic_studies
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Evaluation_studies
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Guideline
Limite:
Female
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Humans
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Male
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Pregnancy
Idioma:
En
Ano de publicação:
2018
Tipo de documento:
Article