Nitrogen Balance
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A nitrogen balance study is the comparison of nitrogen being consumed (orally or via IV) compared to the amount of nitrogen being lost from the body. Most nitrogen is lost via the urine, but some is lost with feces, sweat and sloughed off skin cells.

Three scenarios of N-balance

Calculation of N-balance

Nitrogen Balance

N In:

Food
TPN AA

N Out:

Urine
Feces
Sweat
Skin