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Related Experiment Videos

Day 7 (D7) patch test reading - valuable or not?

J C Mitchell

    Contact Dermatitis
    |June 1, 1978
    PubMed
    Summary
    This summary is machine-generated.

    Late-reading patch tests on Day 7 (D7) revealed positive reactions in one fifth of patients previously showing negative results on Day 2 (D2). This highlights the importance of delayed readings in patch testing for accurate allergy diagnosis.

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    Area of Science:

    • Dermatology
    • Allergology
    • Clinical Immunology

    Background:

    • Patch testing is a standard diagnostic tool for allergic contact dermatitis.
    • Standard patch test readings are typically performed on Day 2 (D2) and Day 4 (D4).
    • Delayed reactions can occur beyond the conventional reading times.

    Purpose of the Study:

    • To evaluate the significance of Day 7 (D7) readings in patch testing.
    • To determine the frequency of positive patch test reactions initially missed on D2.

    Main Methods:

    • A total of 15,469 patch tests were analyzed.
    • Readings were conducted on 499 patients.
    • Comparisons were made between D2 and D7 readings.

    Main Results:

    Related Experiment Videos

    • Positive reactions were observed at D7 in one-fifth of patients.
    • These D7 reactions were initially judged as negative at D2.
    • This indicates a substantial number of delayed hypersensitivity reactions.

    Conclusions:

    • Day 7 readings are crucial for identifying delayed hypersensitivity reactions in patch testing.
    • Delayed readings can improve the diagnostic accuracy of patch tests.
    • Further investigation into the clinical significance of D7 reactions is warranted.