. Author manuscript; available in PMC: 2011 Jan 1.

Published in final edited form as: Neurogastroenterol Motil. 2009 Jul 13;22(1):e15–e26. doi: 10.1111/j.1365-2982.2009.01361.x

Appendix Table III.

Precision of the Assay in Urine: Intra- and Inter-assay Precision Analyzing 3 Concentration Levels of Lactulose and Mannitol in Urine (CV = coefficient of variation)

Within-run	Lactulose		Mannitol

	Mean ± SD (ug/mL)	CV %	Mean ± SD (ug/mL)	CV %
Low	36.0 ± 3.7	10.2	47.7 ± 10.4	21.9
Medium	100.1 ± 10.1	10.1	99.6 ± 16.9	17.0
High	175.6 ± 23.9	13.6	160.1 ± 22.7	14.2



Between-run

	Mean ± SD (ug/mL)	CV %	Mean ± SD (ug/mL)	CV %

Low	30.1 ± 5.3	17.7	48.6 ± 9.2	18.9
Medium	93.7 ± 23.4	24.9	98.1 ± 15.9	16.2
High	158.3 ± 37.2	23.5	161.0 ± 21.8	13.6