A new fungal surrogate marker, (1-3)-β-D glucan, offers a noninvasive method for the potential surveillance and diagnosis of invasive fungal infections. Invasive fungal infections have long been associated with significantly high morbidity and mortality on hematology-oncology wards and recipients of either solid-organ or hematopoietic stem cell transplantation. The diagnoses of invasive fungal infections have historically been made difficult by the need for invasive methods.(1-3)-β-D-glucan testing requires a minimally invasive sample that can be used to aid in the diagnosis of an invasive fungal infection as well as monitor the response to treatment. One disadvantage of (1-3)-β-D-glucan testing is that a positive test alone lacks sufficient sensitivity and specificity for a definitive diagnosis. While formal guidelines for the use of (1-3)-β-D-glucan testing are lacking, this chromogenic assay provides a new opportunity for testing at-risk populations. A review and recommendation for its laboratory and clinical application are provided.
Glossary(1-3)-β-D-glucan: A polysaccharide component of the cell wall of most fungi pyrogen test. An assay used to determine if a pharmaceutical or medical device intended for human use will stimulate fever.Keywords: (1-3)-β-D glucan, beta glucan assay, invasive fungal infections After reading this article, readers should be able to discuss what (1-3)-β-D glucans are, how they are detected in clinical biological samples, the evidence to support laboratory testing and monitoring, the limitations of testing, and the appropriate clinical setting for testing.Microbiology 71103 questions and corresponding answer form are located after this CE Update on page 686.