PATCH TEST


Meaning of PATCH TEST in English

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).

Britannica Concise Encyclopedia.      Краткая энциклопедия Британика.