Active Q Fever infections are characterized by a fourfold increase in serum IgG between acute and convalescent samples and/or the presence of IgM antibodies directed against phase II organisms. In chronic Q Fever the IgG and/or IgM response is most often directed against phase I organisms, resulting in phase I titers that are greater than phase II titers.

If a screen is positive the appropriate titer will be performed at an additional charge. Titers are not performed or reported if screens are negative. Coxiella burnetti IgA will no longer be performed if the IgG or IgM are positive.

This test is approved for New York patient testing.

• Q Fever (Coxiella burnetii) IgG with Reflex to Titers
• Q Fever (Coxiella burnetii) IgM with Reflex to Titers

Active Q fever infections are characterized by a four fold increase in Phase II IgG between acute and convalescent samples. In chronic Q fever, Phase I IgG and/or IgM titers are usually greater than Phase II titers. Past infection is usually associated with roughly equivalent Phase I and Phase II IgG titers. Diagnosis of acute Q fever based on a single IgG titer is difficult. Phase II IgG titer between 1:16 and 1:256 in the absence of Phase I IgG titers are not considered significant and may be seen in the healthy, asymptomatic population. If the screen is positive a titer will be performed at an additional charge.

This test is approved for New York patient testing.

Active Q fever infections are characterized by the presence of Phase II IgM. In chronic Q fever, Phase I IgG and/or IgM titers are usually greater than Phase II titers. If the screen is positive a titer will be performed at an additional charge.

This test is approved for New York patient testing.