Table 5.

Fractional excretion of citrulline, choline, and kynurenic acid

Patient	Creatinine: U/P	Citrulline		Choline		Kynurenic acid
		U/P	FE (%)	U/P	FE (%)	U/P	FE (%)
6	42.3	0.14	0.3	1.15	2.7	53.9	128
7	52.7	0.10	0.2	2.70	5.1	118.6	225
8	29.3	0.04	0.1	1.42	4.8	64.9	221
9	33.3	0.17	0.5	1.95	5.9	49.0	147
Mean	39.4	0.11	0.3	1.81	4.6	71.6	180

U/P, urine-to-plasma ratio; FE, fractional excretion.