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Test ID FBAB Babesia microti Antibodies (IgG, IgM)

Method Name

Immunofluorescence Assay (IFA)

Reporting Name

Babesia Microti Antibodies IgG, IgM

Specimen Type


Specimen Required

Draw blood in a plain, red-top tube(s) or serum gel tube(s). Spin down and send 1 mL of serum refrigerate in a plastic vial.

Specimen Minimum Volume

0.1 mL

Specimen Stability Information

Specimen Type Temperature Time
Serum Refrigerated (preferred) 7 days
  Frozen  30 days
  Ambient  72 hours

Reference Values

Reference Ranges


IgG: <1:64




Elevated antibody levels to B. microti indicate exposure to the organism. Human babesiosis infection is transmitted by the bite of an infected Ixodes tick or less frequently from transfusion with blood from an infected donor. Definitive diagnosis is made by identifying intraerythrocytic organisms in peripheral blood. In patients with low parasitemia, antibody detection by IFA is recommended. IgG levels greater than or equal to 1:1024 can be detected in acute phase patients with parasites in blood smears. The IFA assay can be used as a seroepidemiologic tool to study the frequency and distribution of B. microti in endemic areas especially in persons with mixed infections also involving Borrelia burgdorferi.


Day(s) and Time(s) Performed

Tuesday through Saturday

Performing Laboratory

Focus Diagnostics, Inc.

Test Classification

This test was developed and its performance characteristics have been determined by Focus Diagnostics. It has not been cleared or approved by the U.S. Food and Drug Administration. The FDA has determined that such clearance or approval is not necessary. Performance characteristics refer to the analytical performance of the test.

CPT Code Information

86753 x 2

LOINC Code Information

Test ID Test Order Name Order LOINC Value
FBAB Babesia Microti Antibodies IgG, IgM In Process


Result ID Test Result Name Result LOINC Value
Z0718 Babesia microti IgG 16117-4
Z0520 Babesia microti IgM 16118-2
Z0521 Interpretation In Process