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91552M
FRANCISELLA ANTIBODY, SERUM

Test Code 91552M 
Test FRANCISELLA ANTIBODY, SERUM 
Methodology Direct Aggulation 
Description Useful for the detection of agglutinating antibodies in patients having tularemia. 
Specimen Draw blood in either a plain, red-top tube or serum gel tube. Spin down and send 1.0 mL (minimum: 0.5 mL) of serum refrigerated in a screw-capped, plastic vial. 
Reference Values 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. 

Analytic Time 1 - 5 Days 
Day(s) Test Set Up Monday through Friday 
CPT Code(s) 86000