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All who must frequently perform multiple patch tests are dismayed by the limitation as to the number of tests it is possible to make at one visit. The forearms are usually the areas of choice, but owing to the limited space it is necessary to use the trunk in addition when one desires to apply many patches. One great disadvantage of patch tests made on the trunk is that during sleep the patient frequently tears off the patches when tossing about.
The object of this article is to suggest the use of a new method of applying patches so that from twenty-five to forty instead of from four to six tests may be made on the forearms at each sitting.
Figure 1 shows a forearm on which patches have been applied according to the method in present use. A small square of blotting-paper containing the substance to be tested is
BIEDERMAN JB. A NEW METHOD OF MAKING MULTIPLE PATCH TESTS. Arch Derm Syphilol. 1938;37(2):198–200. doi:10.1001/archderm.1938.01480080031004
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