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Published on: March 22, 2012
[Repeating the Platelia™ Aspergillus test in samples positive for serum galactomannan: Is it necessary?]
María Pía Roiz1, María del Sol García1, Luis Martínez-Martínez1
1Servicio de Microbiología, Hospital Universitario Marqués de Valdecilla, Instituto de Investigación Sanitaria Valdecilla (IDIVAL), Santander, Cantabria, España.
Background:
The manufacturers of the Platelia™ Aspergillus test recommend retesting every sample with a positive result to galactomannan detection.
Aims:
To evaluate the repeated results of the Platelia™ Aspergillus test on initially positive samples, and their association with clinical and microbiological studies.
Methods:
A total of 150 positive sera belonging to 92 patients were studied. More than one positive sample was obtained from 31 (33.6%) patients. Nine patients were diagnosed with probable invasive aspergillosis and two with proven Fusarium oxysporum and Scedosporium prolificans invasive fungal infection, respectively.
Results:
Only 35 out of 150 (23.3%) sera remained positive upon test repetition. The average OD-index difference between the initially positive and subsequently negative samples was 0.76. Sera from 3 patients out of 9 diagnosed with probable invasive aspergillosis yielded negative results after repetition.
Conclusions:
Our study shows poor reproducibility of the positive samples for the Platelia™ Aspergillus test. These results reinforce the need to evaluate a second sample and to consider simultaneously repeating the first positive serum to enhance the diagnosis of invasive fungal infection.
