GRAB - Clinical: Giardia Antibody, IFA

Test Catalog

Test Name

Test ID: GRAB    
Giardia Antibody, IFA

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.




<1:16    Antibody Not Detected

1:16  Equivocal; submission of a second specimen (collected 3-4 weeks after initial specimen) suggested if clinically warranted

> or = 1:32 Antibody Detected


A polyvalent conjugate (recognizing IgG, IgM and IgA) is used to detect the presence of antibodies to Giardia lamblia.  A four-fold or greater increase in titer between acute and convalescent sera indicates an acute active phase.  A single positive reaction represents previous exposure, since antibody titers are known to remain high for at least six months.