ARUP's Laboratory Test Directory
| 0050381: Rickettsia typhi (Typhus Fever) Antibody, IgG by IFA |
| Test Mnemonic: TYPHU G | |
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Methodology: Indirect Fluorescent Antibody
Performed: Tue, Fri Reported: 1-5 days |
| Specimen Required: | |
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Collect: One 4 mL SST.
Transport: 1 mL serum at 2-8°C. (Min: 0.5 mL) Submit specimen in an ARUP Standard Transport Tube. Pediatric Collection/Transport: 0.15 mL serum at 2-8°C. Remarks: Separate serum from cells ASAP. Acute and convalescent specimens must be labeled as such; parallel testing is preferred and convalescent specimens must be received within 30 days from receipt of the acute specimens. Please mark specimens plainly as "acute" or "convalescent." Unacceptable Conditions: Severely lipemic, hemolyzed, or contaminated specimens. Stability: After separation from cells:Ambient: 2 days; Refrigerated: 2 weeks; Frozen: 1 year (avoid repeated freeze/thaw cycles) |
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| Reference Interval: |
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< 1:64 Negative - No significant level of Rickettsia typhi IgG antibody detected. 1:64-1:128 Equivocal - Questionable presence of Rickettsia typhi IgG antibody detected. Repeat testing in 10-14 days may be helpful. ³ 1:256 Positive - Presence of IgG antibody to Rickettsia typhi detected, suggestive of current or past infection. |
| Interpretive Data: | |
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This test is for antibodies to Rickettsia typhi. Any antibody reactivity to Rickettsia typhi antigen should, however, also be considered group-reactive for the Typhus Fever group (Rickettsia prowazekii). Seroconversion between acute and convalescent sera is considered strong evidence of recent infection. The best evidence for infection is a significant change (fourfold difference in titer) on two appropriately timed specimens, where both tests are done in the same laboratory at the same time.
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| CPT Code(s): | |
| 86757 |