( Fractional ( ( ( ( ( ( Urea Excretion ) ( -LRB- ( FEUN -RRB- ) ) ) , ) Plasma ) or ) ( ( Serum and ) Urine ) ) )
(ROOT (S (VP (VB Fractional) (NP (NP (NP (NNP Urea) (NNP Excretion)) (PRN (-LRB- -LRB-) (NP (NNP FEUN)) (-RRB- -RRB-))) (, ,) (NP (NNP Plasma)) (CC or) (NP (NNP Serum) (CC and) (NNP Urine))))))
Fractional Urea Excretion (FEUN), Plasma or Serum and Urine
(ROOT (S (NP (NNP Urea)) (VP (VBZ is) (VP (VP (VBN made) (PP (IN in) (NP (DT the) (NN liver)))) (CC and) (VP (VBN excreted) (PP (IN in) (NP (NN urine)))))) (. .)))
Urea is made in the liver and excreted in urine.