ARUP's Laboratory Test Directory

Bartonella quintana Antibody, IgG by IFA : 0050094

Mnemonic: QUINT G

Methodology: Semi-Quantitative Indirect Fluorescent Antibody
Performed: Mon, Thu
Reported: 1-8 days
Specimen Required: Collect: 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: 0.15 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: Refrigerated.

Unacceptable Conditions: Contaminated, hemolyzed, or severely lipemic specimens.

Stability (collection to initiation of testing): After separation from cells: Ambient: 48 hours; Refrigerated: 2 weeks; Frozen: 1 year (avoid repeated freeze/thaw cycles)

Reference Interval:
< 1:64 Negative - No significant level of Bartonella quintana IgG antibody detected.
1:64-1:128 Equivocal - Questionable presence of Bartonella quintana IgG antibody detected. Repeat testing in 10-14 days may be helpful.
≥1:256 Positive - Presence of IgG antibody to Bartonella quintana 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 a significant change on two appropriately timed specimens where both tests are done in the same laboratory at the same time.

See Compliance Statement A: www.aruplab.com/CS
CPT Code(s): 86611
Cross References: Trench Fever (Bartonella quintana Antibody, IgG by IFA)