Dextrose-containing fluids causing false-positive serum galactomannan: a case-control study and interrupted time series analysis.
Clin Microbiol Infect
; 30(5): 682.e1-682.e4, 2024 May.
Article
em En
| MEDLINE
| ID: mdl-38309324
ABSTRACT
OBJECTIVES:
This study aimed to identify the cause of false-positive serum Aspergillus antigen galactomannan (GM) results in our centre.METHODS:
We performed a case-control study aiming to elucidate the factors associated with false-positive GM results. Independent risk factors for false-positive GM were evaluated through a multivariable regression analysis. An interrupted time series analysis was used to evaluate the effectiveness of an intervention removing the identified factors.RESULTS:
Among 568 patients tested, GM was positive in 130 patients of whom 97 had false-positive GM (cases). These were compared with 427 patients with true-negative GM (controls). Administration of dextrose-containing fluids within 6 days before GM testing was an independent predictor for false-positive GM results (adjusted odds ratio [aOR], 18.60; 95% CI, 8.95-38.66. An analysis of GM presence in different dextrose-containing fluids revealed positivity in 34.8% (8 of 23) (manufacturer A) and 33.3% (5 of 15) (manufacturer B) of the samples. Investigation of the manufacturing process revealed that the saccharification process employed enzymes derived from Aspergillus niger. After identifying the root cause of false positivity, GM-containing dextrose fluid use was restricted. Interrupted time series analysis showed an immediate reduction of GM false-positivity (-6.5% per week, p = 0.045) and a declining trend (-0.33% per week, p = 0.005) postintervention.CONCLUSIONS:
Administering dextrose-containing fluids was the primary factor causing false-positive serum Aspergillus antigen GM assay results. Our investigation led to a modification of the manufacturing process of the dextrose-containing fluids.Palavras-chave
Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Aspergilose
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Análise de Séries Temporais Interrompida
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Galactose
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Glucose
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Mananas
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Antígenos de Fungos
Idioma:
En
Ano de publicação:
2024
Tipo de documento:
Article