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Test ID: FRANC    
Francisella Tularensis Antibody

Available on the App Store

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.

Reference Range:  <1:20


Interpretive Criteria:

<1:20 Negative

1:20 - 1:80 Equivocal

> or =1:160 Positive


In the presence of compatible symptoms, a Francisella tularensis antibody titer of 1:160 or greater in an acute specimen supports a presumptive diagnosis of tularemia. However, a titer > or =1:160 may also reflect past infection. An equivocal titer may be due to crossreactive antibodies (Brucella, Yersinia, or Proteus OX19), past infection, or very recent infection. A four-fold rise in titer between acute and convalescent sera is required for definitive serologic diagnosis of tularemia.


Test Performed By:  Focus Diagnostics, Inc.

                              33608 Ortega Highway

                              San Juan Capistrano, CA 92675