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Related Experiment Videos

Complement-fixing hidden rheumatoid factor in juvenile rheumatoid arthritis

T L Moore, J Zuckner, A R Baldassare

    Arthritis and Rheumatism
    |November 1, 1978
    PubMed
    Summary

    A new hemolytic assay detects hidden rheumatoid factors (RF) in 59% of juvenile rheumatoid arthritis (JRA) patients, significantly more than traditional tests. Higher RF titers correlate with active JRA disease.

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    Area of Science:

    • Rheumatology
    • Immunology
    • Pediatric Rheumatology

    Background:

    • Juvenile rheumatoid arthritis (JRA) diagnosis can be challenging due to variable rheumatoid factor (RF) presence.
    • Traditional latex fixation tests (LFT) detect RF in only 15-20% of JRA patients.
    • A subset of JRA patients (approx. 46%) have 'hidden' RF (19S IgM RF) not detected by standard LFT.

    Purpose of the Study:

    • To evaluate a complement-dependent hemolytic assay for detecting hidden RF in seronegative JRA.
    • To compare the sensitivity of the hemolytic assay against LFT for RF detection in JRA.
    • To assess the correlation between RF titers and disease activity in JRA.

    Main Methods:

    • A complement-dependent hemolytic assay was employed to detect hidden RF in patients with seronegative JRA.

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  • Serum samples from JRA patients and healthy/disease controls were analyzed.
  • RF titers were compared between JRA patient groups (active polyarticular, active pauciarticular) and controls.

    • Main Results:

    • The hemolytic assay identified hidden RF in 59% of seronegative JRA patients.
    • Median RF titers were significantly higher in JRA patients (1:42) compared to controls (1:7; P < 0.001).
    • Active polyarticular JRA (median 1:97) and pauciarticular JRA (median 1:91) showed significantly elevated titers (P < 0.001 and P < 0.005, respectively).

    Conclusions:

    • The hemolytic assay is more sensitive than LFT for detecting hidden RF in JRA.
    • Elevated hemolytic RF titers correlate strongly with active JRA disease.
    • This assay offers improved diagnostic potential for JRA, particularly in seronegative cases.