Ordering Recommendation

May assist in confirming a current or past Bartonella henselae infection.

New York DOH Approval Status

This test is New York state approved.

Specimen Required

Patient Preparation

Serum separator tube.

Specimen Preparation

Separate serum from cells ASAP or within 2 hours of collection. Transfer 1 mL serum to an ARUP standard transport tube. (Min: 0.4 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

Contaminated, hemolyzed, or severely lipemic specimens.


After separation from cells: Ambient: 48 hours; Refrigerated: 2 weeks; Frozen: 1 year (avoid repeated freeze/thaw cycles)


Semi-Quantitative Indirect Fluorescent Antibody (IFA)


Mon, Thu


1-8 days

Reference Interval

<1:64  Negative - No significant level of Bartonella henselae IgG antibody detected.
1:64-1:128  Equivocal - Questionable presence of Bartonella henselae IgG antibody detected.  Repeat testing in 10-14 days may be helpful.
≥1:256  Positive - Presence of IgG antibody to Bartonella henselae detected, suggestive of current or past infection.

Interpretive Data

A low positive result suggests past exposure or infection, while a high positive result may indicate recent or current infection, but is inconclusive for diagnosis.  Seroconversion between acute and convalescent sera is considered strong evidence of recent infection.  The best evidence for infection is significant change on two appropriately timed specimens where both tests are done in the same laboratory at the same time.

Compliance Category

Analyte Specific Reagent (ASR)


Hotline History


CPT Codes



Component Test Code* Component Chart Name LOINC
0050091 Bartonella henselae Antibody IgG 6954-2
* 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 henselae IgG
  • Bartonella henselae IgG
Bartonella henselae Antibody, IgG by IFA