Reference Interval:
Less than 1:20 - Negative
1:20 to 1:80 - Equivocal
Greater than or equal to 1:160 - Positive
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| Interpretive Data: |
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 greater than or equal to 1:160 may also reflect past infection. An equivocal titer may be due to crossreactive antibodies (Brucella, Yersinia, or Rickettsia), 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.
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| CPT Code(s): |
86668
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