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Related Experiment Videos

Cystic fibrosis. Problems encountered with sweat testing.

B J Rosenstein, T S Langbaum, E Gordes

    JAMA
    |October 27, 1978
    PubMed
    Summary

    The sweat test is crucial for diagnosing cystic fibrosis. Re-testing at Johns Hopkins revealed diagnostic changes in 43.5% of patients, with most prior results being false positives.

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    Area of Science:

    • Medical Diagnostics
    • Pulmonology
    • Genetics

    Background:

    • Cystic fibrosis diagnosis relies on the sweat test.
    • Previous sweat test results may be inaccurate.

    Purpose of the Study:

    • To evaluate the impact of repeat sweat testing on cystic fibrosis diagnosis.
    • To identify discrepancies in previous sweat test results.

    Main Methods:

    • Quantitative pilocarpine-iontophoresis sweat tests were performed.
    • 234 patients were referred for sweat testing.
    • 62 patients had prior sweat test results.

    Main Results:

    • Repeat testing changed the diagnosis in 27 (43.5%) of 62 patients.
    • The majority of diagnostic changes were due to false-positive prior results.
    • This highlights potential inaccuracies in initial sweat tests.

    Conclusions:

    • Repeat sweat testing is essential for accurate cystic fibrosis diagnosis.
    • False-positive results can lead to misdiagnosis.
    • Clinical centers should verify previous sweat test findings.

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