US
Pork is not graded by USDA grades. The quality of pork is determined by the color, texture, and marbling by visual examination as well as tests such as measuring the PH level and backfat thickness, and carcass muscling (lean quality).
Europe
The pork carcass classification system was introduced to the EU in 1984. The evaluation is based on computer technology that involves the use of needle measurements of backfat thickness and lean meat content. Pork imported from Europe is marked with a letter that signifies the class.