BEDDOE: The last part of the equation [urea] is made up of two numbers: the nitrate nitrogen number on top the ammonia nitrogen number below. They represent nitrogen oxide and nitrogen sulfate, as found in the urine.
NOTE: At one point in his textbook Dr. Beddoe speaks of agricultural urea which is correctly composed of ammonia & carbon dioxide.
CHALLEN: People with high ureas will complain about insomnia.
CHALLEN: The stronger the ammonia odor is in the urine, then the higher the urea numbers are.