SBL - Clinical: Blastomyces Antibody by Immunodiffusion, Serum

Test Catalog

Test Name

Test ID: SBL    
Blastomyces Antibody by Immunodiffusion, Serum

Useful For Suggests clinical disorders or settings where the test may be helpful

Detection of antibodies in patients having blastomycosis

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.

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.


Interpretation Provides information to assist in interpretation of the test results

A positive result is suggestive of infection, but the results cannot distinguish between active disease and prior exposure.


Routine culture of clinical specimens (eg, respiratory specimen) is recommended in cases of suspected, active blastomycosis.

Cautions Discusses conditions that may cause diagnostic confusion, including improper specimen collection and handling, inappropriate test selection, and interfering substances

The Mayo experience with the immunodiffusion test is that it is positive in fewer cases of blastomycosis than the 70% to 85% reported elsewhere.


Patients with histoplasmosis may have low-titered cross reactions.

Clinical Reference Recommendations for 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, ASM Press, 1997, pp 588-589