The prepared patch for cutaneous tests is a time saver and a great convenience. Its chief advantage is that it can be given to a patient with instructions to put it on two or three days before returning to the office. This eliminates the necessity of an extra office visit to read the reaction to the test and saves valuable office time. The patches can be prepared in quantity by a technician or an office assistant. They keep for months. When prepared patches are available one is more likely to give patients cutaneous tests for specific sensitivity to drugs one is planning to use in treatment. Six agents have been used in my routinely prepared patches, but the method can be adapted to include a wider variety of substances.
In preparing the patch I use strips of adhesive tape 1½ inches (4 cm.) wide and about 7 inches (18 cm.)
Fowle LP. PREPARED PATCH FOR CUTANEOUS TESTS. Arch Derm Syphilol. 1943;47(6):852. doi:10.1001/archderm.1943.01500240092015
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