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Test ID FRANC Francisella Tularensis Antibody

Method Name

Direct Aggulation (DA)

Reporting Name

Francisella tularensis Ab

Specimen Type

Serum

Draw blood in a plain, red-top tube(s). Spin down and send 1 mL of serum, ambient.

 

NOTE:  Serum gel tube is acceptable, but must pour off into a plastic vial.

Specimen Minimum Volume

0.5 mL; Peds 0.075 mL

Specimen Stability Information

Specimen Type Temperature Time
Serum Ambient (preferred) 7 days
  Frozen  30 days
  Refrigerated  14 days

Reference Values

Reference Range:  <1:20

  

Interpretive Criteria:

<1:20 Negative

1:20 - 1:80 Equivocal

≥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 ≥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.

 

Day(s) Performed

Monday through Friday

Report Available

1 - 4 days

Performing Laboratory

Focus Diagnositics, Inc.

Test Classification

This test was developed and its performance characteristics have been determined by Focus Diagnostics. Performance characteristics refer to the analytical performance of the test.

CPT Code Information

86000

NY State Approved

Yes