According to the USDA site (ASCII file of the nutrient definition file
http://www.nal.usda.gov/fnic/foodco...sc/NUTR_DEF.txt ), they use the CHOCDF method of carbohydrate measurement, which is the following, and does not subtract fiber.
CHOCDF> Total carbohydrate by difference, calculated as 100g minus the sum of grams of water, protein, fat, alcohol and ash
These are the different methods:
<CHOCDF> Total carbohydrate by difference, calculated as 100g minus the sum of grams of water, protein, fat, alcohol and ash
<CHOCSM> Total carbohydrate calculated by summation of analytical values of free sugars, dextrin, oligosaccharides, starch, glycogen
<CHOAVLDF> Available carbohydrate by difference, calculated as 100g minus the sum of grams of water, protein, fat, fibre, alcohol and ash
<CHOAVL> Available carbohydrate, calculated by summation of analytical values of free sugars, dextrin, oligosaccharides, starch, glycogen
<CHOAVLM> Available carbohydrate expressed as monosaccharide equivalent