Metal sensitivity: positive history but negative test indicates atopy

Area of Science:

• Allergy and Immunology
• Dermatology
• Toxicology

Background:

• Metal sensitivity is a common concern.
• Patch testing is standard for diagnosing metal allergies.
• Some patients with suspected metal sensitivity test negative.

Purpose of the Study:

• To investigate the underlying causes of metal sensitivity in patients negative to common metal allergens.
• To explore the prevalence of atopy in this patient group.

Main Methods:

• Patch testing for nickel, cobalt, and chromate.
• Epicutaneous and intracutaneous testing in a subset of patients.
• Clinical diagnostic methods to assess atopy.

Main Results:

• 50 patients with suspected metal sensitivity were patch-test-negative to nickel, cobalt, and chromate.
• 20 of these patients underwent further testing.
• Most patients in this cohort were found to be atopic.

Conclusions:

• Negative patch test results for common metals do not rule out other causes of sensitivity.
• Atopy may play a significant role in patients experiencing symptoms attributed to metal sensitivity.
• Further investigation is warranted for patients with unexplained metal sensitivity.