Interlaboratory Variation
Mostrando 1-12 de 31 artigos, teses e dissertações.
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1. Potency Evaluation of Recombinant Human Erythropoietin in Brazil: Assessment of Reproducibility Using a Practical Approach
In this study, we compared the results of potency determination of recombinant human erythropoietin (rhEPO) obtained between 2010 and 2012 by the National Institute of Quality Control in Health (INCQS/Fiocruz), i.e., the National Control Laboratory (NCL), and by a manufacturer of rhEPO. In total, 47 different batches of commercially prepared rhEPO (alpha iso
Braz. arch. biol. technol.. Publicado em: 01/05/2015
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2. Collaborative studies to evaluate the chemical composition of feeds / Estudos colaborativos para avaliação da composição química de alimentos
Objetivou-se conduzir estudos colaborativos para avaliação dos teores de matéria seca (MS), fibra em detergente neutro (FDN), proteína bruta (PB), extrato etéreo (EE), matéria mineral (MM) e fibra indigestível em detergente neutro (FDNi) e em detergente ácido (FDAi) em alimentos. Todos os sete laboratórios participantes do estudo pertenciam a instit
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/02/2011
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3. Certification reference material of iron ore by interlaboratory program / Certificado de material de referência de minério de ferro utilizando programa interlaboratorial
Brazil is one of the great worldwide iron ore producers and exports most of its production. In the international trade it is important to make sure the comparison of the analytical results among different laboratories. A variation of 0,1% in the average of the iron content can increase or decrease the value of a large ore shipment. Thus, the quality guarante
Publicado em: 2007
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4. Field study of lyophilised plasmas for local prothrombin time calibration in The Netherlands.
AIM: To assess the effect of a lyophilised calibrant plasma procedure on the international normalised ratio (INR) and its interlaboratory variation. METHODS: INR equivalent values were assigned to five lyophilised plasmas (one from normal donors and four from coumarin treated patients) by a reference laboratory using three calibrated thromboplastin reagents.
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5. Investigation into paediatric bilirubin analyses in Australia and New Zealand.
A small regional survey of direct spectrophotometric methods and a larger Australian and New Zealand survey of paediatric bilirubin analyses are described. The overall performance of both groups was unsatisfactory with an unacceptable high interlaboratory variation. This interlaboratory variation was reduced significantly by the use of a spectrophotometric m
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6. Rate of Pyrite Bioleaching by Thiobacillus ferrooxidans: Results of an Interlaboratory Comparison
Ten laboratories participated in an interlaboratory comparison of determination of bioleaching rates of a pyrite reference material. A standardized procedure and a single strain of Thiobacillus ferrooxidans were used in this study. The mean rate of bioleaching of the pyrite reference material was 12.4 mg of Fe per liter per h, with a coefficient of variation
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7. Detection of Antigen in Sera of Patients with Invasive Aspergillosis: Intra- and Interlaboratory Reproducibility
The intra- and interlaboratory reproducibilities of a commercial sandwich enzyme-linked immunosorbent assay (ELISA) for the detection of Aspergillus galactomannan in serum (Platelia Aspergillus; Sanofi Diagnostics Pasteur, Marnes-La-Coquette, France) were evaluated in six laboratories of university hospitals. Twenty serum samples were obtained from 12 neutro
American Society for Microbiology.
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8. Interlaboratory variability of CD8 subset measurements by flow cytometry and its applications to multicenter clinical trials. NAID/NICHD Women and Infants Transmission Study Group.
Recent studies have demonstrated the utility of measuring subsets of CD8+ T cells as prognostic markers in epidemiology cohort studies of human immunodeficiency virus (HIV)-infected patients. Most of these studies evaluating the value of CD8+ T-cell subsets have been performed at single centers, and few data are available on variability in the measurement of
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9. Accuracy of gas analysis in lung function laboratories.
Fifty lung function laboratories in England and Wales analysed test gas mixtures of carbon monoxide and helium. Most of them also analysed mixtures of oxygen and carbon dioxide in nitrogen. The percentage accuracy of the results was within 1% of the expected value in only 14% of determinations of carbon monoxide concentration, 28% for carbon dioxide, 37% for
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10. Multicenter comparative evaluation of two rapid microscopic methods and culture for detection of Chlamydia trachomatis in patient specimens.
Four hundred and seventy-three men and women at high risk for sexually transmitted disease were tested for the presence of Chlamydia trachomatis in the urethra or the endocervix. Four groups were involved in this multicenter study of two direct fluorescent-antibody microscopy tests, Kallestad Pathfinder and Syva Microtrak, compared with culture techniques. R
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11. Low hepatic iron concentration: evaluation of two complementary methods, colorimetric assay and iron histological scoring.
AIMS: To validate a method of assessment of low hepatic iron concentration based on a biochemical colorimetric assay plus histological scoring. METHODS: The within-day and day to day precision of the iron colorimetric assay was determined on frozen rat liver. The coefficient of variation (CV) of iron measurement in two separate samples from the same liver wa
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12. Multicenter comparison of levels of antibody to the Neisseria meningitidis group A capsular polysaccharide measured by using an enzyme-linked immunosorbent assay.
There is no standard immunoassay for evaluating immune responses to meningococcal vaccines. We developed an enzyme-linked immunosorbent assay to measure total levels of antibody to Neisseria meningitidis group A capsular polysaccharide. Five laboratories measured the antibody levels in six paired pre- and postvaccination serum samples by using the enzyme-lin