A test kit for determining the relative level of nitrogen of a user who is involved in a health program where diet and exercise are monitored and adjusted for optimizing physical development, the system includes a plastic stick having a first reagent zone on which is included a reactant such as urease,...http://www.google.ca/patents/US5260219?utm_source=gb-gplus-sharePatent US5260219 - Method of determining nitrogen balance and fat loss for persons involved in diet and/or physical training program
