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Problems with beaded fluorescence pattern in FTA-ABS test

F D Pien, H Markowitz, C H McKenna

    Journal of the American Venereal Disease Association
    |September 1, 1976
    PubMed
    Summary
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    False-positive results in the fluorescent treponemal antibody absorption (FTA-ABS) test can occur in patients without syphilis, particularly those with antinuclear antibodies or rheumatoid factor. These findings highlight potential diagnostic challenges in syphilis testing.

    Area of Science:

    • Immunology
    • Medical Diagnostics
    • Serology

    Background:

    • The fluorescent treponemal antibody absorption (FTA-ABS) test is a key diagnostic tool for syphilis.
    • False-positive results can complicate diagnosis and patient management.
    • Understanding the causes of false positivity is crucial for accurate serological interpretation.

    Purpose of the Study:

    • To evaluate the significance of false-positive FTA-ABS fluorescence in various clinical conditions.
    • To identify patient groups and factors associated with non-specific FTA-ABS reactivity.
    • To assess the reliability of the FTA-ABS test in the presence of other autoantibodies.

    Main Methods:

    • Serum samples from different patient cohorts were analyzed for FTA-ABS reactivity.

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  • Patients included those without syphilis, with rheumatoid factor (RF), with antinuclear antibodies (ANA), and those with diagnostic challenges.
  • Control groups of normal blood donors were also included.

    • Main Results:

    • Low-intensity FTA-ABS fluorescence was observed in 12% of patients with ANA titers ≥ 1:32 and no syphilis history.
    • Reactivity was noted in 20% of patients with RF titers ≥ 1:640, including those with a syphilis history.
    • A beaded pattern, indicative of potential false positivity, was found in 2.1% of patients with diagnostic problems and varied based on antigen and storage.

    Conclusions:

    • False-positive FTA-ABS results are observed in patients with connective tissue diseases and other conditions, particularly those with elevated ANA or RF titers.
    • The beaded pattern on FTA-ABS testing can be present in diverse patient groups, including those without syphilis.
    • Variability in FTA-ABS patterns underscores the need for careful interpretation in conjunction with clinical findings and other serological tests.