See Also: patch test(encyclopedia)
patch test(medicine)
photo-patch test(medicine)
Patch(money)
outside out patch(medicine)
patch(1)(dictionary)
patch(dictionary)
eye patch(dictionary)
patch(2)(dictionary)
Hutchinson's patch(medicine)

patch test (sh)




Controlled application of biological or chemical substances to the skin to test for allergy.

Small amounts of diluted test substances applied under a patch of cloth or soft paper and an impermeable membrane are left in place for 48 hours, and the skin reaction is then examined and scored from 0 (none) to 4+ (severe blistering and redness).