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Test Code
SynonymsTreponema pallidum Antibody, IgG by IFA (FTA-ABS), Serum; Fluorescent Treponemal Antibody Absorption Test; FTA, Serum; Syphilis Ab FTA-ABS; T pallidum Ab FTA-ABS; Treponema Antibody, Serum; Treponema pallidum Antibody FTA-ABS, Serum
Container TypeSerum separator tube (gold, brick, SST, or corvac)
Supply Item Numberpicture1467
Specimen TypeSerum
Preferred Volume1 mL
Emergency Minimum Volume0.5 mL
Specimen ProcessingSeparate serum from cells ASAP or within 2 hours of collection and transfer to a standard PAML aliquot tube.
Store and TransportRefrigerated
StabilityRoom Temp 2 weeks  Refrigerated 2 weeks  Frozen (-20 °C) 2 weeks  
Unacceptable ConditionCSF, plasma, or other body fluids; contaminated, hemolyzed, or severely lipemic specimens
CPT Codes86780
Interface Order Code86781.Z1
Billing CodeFTA.LCA
Test ScheduleMon-Fri
Turnaround Time2-3 days
MethodSemi-Quantitative Indirect Fluorescent Antibody
Reference Ranges
FTA, Serum, IgGNonreactive
NotesOrdering Recommendation: Not an optimal reflex test. Treponema pallidum Antibody by TP-PA is preferred.

The Fluorescent Treponema Antibody (FTA) is recommended for follow-up of reactive nontreponemal tests for syphilis, and as a single test in patients suspected of late syphilis. The FTA may be used to resolve discrepancies between laboratory results and clinical impressions. FTA tests for syphilis may be falsely positive in some cases of systemic lupus erythematosus, pregnancy, and leprosy.

Can be used to provide additional evidence of neurosyphilis when VDRL-CSF test results are reactive.

Interface Codes
typeorder codetest descriptionresult coderesult descriptionunitsdecimal placesloinc code
o86781.Z1Fluorescent Treponemal Ab
r86781.Z1FTA, SERUM86781.Z1FTA, SERUM  5393-4