Babesia microti Antibodies, IgG and IgM by IFA
Ordering Recommendation

Useful if Giemsa stain is negative but high suspicion of babesiosis exists. Will not detect B. duncani or strain MO-1.

Semi-Quantitative Indirect Fluorescent Antibody
Mon, Wed, Sat
1-5 days
New York DOH Approval Status
This test is New York DOH approved.
Submit With Order
ARUP Consult®
Disease Topics
Specimen Required
Patient Preparation
Serum Separator Tube (SST). 
Specimen Preparation
Separate from cells ASAP or within 2 hours of collection. Transfer 1 mL serum to an ARUP Standard Transport Tube. (Min: 0.2 mL) Parallel testing is preferred, and convalescent specimens must be received within 30 days from receipt of the acute specimens. Mark specimens plainly as "acute" or "convalescent." 
Storage/Transport Temperature
Unacceptable Conditions
Bacterially contaminated, hemolyzed or lipemic specimens. 
After separation from cells: Ambient: 48 hours; Refrigerated: 2 weeks; Frozen: 1 year (avoid repeated freeze/thaw cycles) 
Reference Interval
Test Number
Reference Interval
0093049Babesia microti Antibody, IgG by IFA< 1:16 Negative - No significant level of detectable Babesia IgG antibody.
1:16  Equivocal -  Repeat testing in 10-14 days may be helpful.
> 1:16  Positive - IgG antibody to Babesia detected, which may indicate a current or past infection.
0093050Babesia microti Antibody, IgM by IFA< 1:20  Negative - No significant level of detectable Babesia IgM antibody.
1:20  Equivocal - Repeat testing in 10-14 days may be helpful.
> 1:20  Positive - IgM antibody to Babesia detected, which may indicate a current or recent infection.

Interpretive Data

Compliance Statement A: For laboratory developed tests using a manufacturer labeled ASR as the reagent providing the specificity of the assay. Analyte Specific Reagent. This test was developed and its performance characteristics determined by ARUP Laboratories. The U. S. Food and Drug Administration has not approved or cleared this test; however, the FDA has determined that such clearance or approval is not necessary.

Hotline History
View Hotline History
Component Test Code*Component Chart NameLOINC
0093049Babesia microti IgG16117-4
0093050Babesia microti IgM16118-2
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.
  • B microti Ab
  • B microti Ab panel
  • Babesia microti Antibodies (IgG, IgM)
  • Babesia Microti IgG/IgM Ab Panel
  • Babesiosis Serology