Blastomyces Antibody by Immunodiffusion, Spinal Fluid
Clinical Information Discusses physiology, pathophysiology, and general clinical aspects, as they relate to a laboratory test
The dimorphic fungus, Blastomyces dermatitidis, causes blastomycosis. When the organism is inhaled, it causes pulmonary disease -- cough, pain, and hemoptysis, along with fever and night sweats. It commonly spreads to the skin, bone, or internal genitalia where suppuration and granulomas are typical. Occasionally, primary cutaneous lesions after trauma are encountered; however, this type of infection is uncommon. Central nervous system disease is uncommon.
Detection of antibodies in patients having blastomycosis
A positive result is suggestive of infection, but the results cannot distinguish between active disease and prior exposure. Furthermore, detection of antibodies in cerebrospinal fluid may reflect intrathecal antibody production, or may occur due to passive transfer or introduction of antibodies from the blood during lumbar puncture.
Routine fungal culture of clinical specimens (eg, cerebrospinal fluid) is recommended in cases of suspected blastomycosis involving the central nervous system.
Cautions Discusses conditions that may cause diagnostic confusion, including improper specimen collection and handling, inappropriate test selection, and interfering substances
A negative result does not rule out blastomycosis.
Patients with histoplasmosis may have low-titered cross-reactions.
Reference Values Describes reference intervals and additional information for interpretation of test results. May include intervals based on age and sex when appropriate. Intervals are Mayo-derived, unless otherwise designated. If an interpretive report is provided, the reference value field will state this.
Clinical References Provides recommendations for further in-depth reading of a clinical nature
Kaufman L, Kovacs JA, Reiss E: Clinical Immunomycology. In Manual of Clinical and Laboratory Immunology. Edited by NL Rose, E Conway-de Macario, JD Folds, et al. Washington, DC, American Society for Microbiology, 1997, pp 588-589