Researchers have tested a standard latex extract in clinical trials, and the data have been submitted to the FDA for approval. But it isn't as sensitive as a skin-prick test. Patch tests, which reveal sensitivities to latex and synthetic rubber additives, are used to diagnose allergic contact dermatitis. In these tests, patches of gloves containing various allergenic rubber chemical additives are taped to the person's back and left in place for 48 to 96 hours. The skin reaction beneath each patch is checked at 48 hours and again at 96 hours to determine which additives cause sensitivity.
Patch tests are reliable for delayed hypersensitivity allergy.
Anaphylaxis is a risk if latex glove patches are used and the person also has an immediate hypersensitivity to latex. More than 200 proteins are found in latex, and more than 50 can cause allergy. Different people react to different proteins. Completely avoiding highly allergenic latex-containing items is important. Investigate your facility's policies for latex-sensitive employees.