. 2017 Mar 1;12(1):3–9. doi: 10.1089/bari.2016.0048

Table 1.

Summary of Mean 24-h Urine Data from Roux-en-Y Gastric Bypass or Restrictive Procedures Stratified by Stone History

	Patient number	Oxalate (mg/day)	Citrate (mg/day)	Volume (L/day)
RYGB and 24-h urine (∼12 months F/U)
Adult NSF, prospective^14–19	277	44	442	1.1
Adult NSF, retrospective^13,20–24	177	54	312	1.1
Adolescents NSF, retrospective²⁵	10	41.8	646	1.49
Primarily stone formers, any type^26–28	166	71	415	1.4
LAGB or SG 24-h urine (∼12 months F/U)
Adult NSF, retrospective^21,22	30	36	NR	1.3
Adolescents NSF, retrospective²⁵	7	26.4	687	0.95

Mean values calculated using weighted averages from multiple studies. Adjusted from Table 1, Canales and Hatch.¹¹

F/U, follow-up; LAGB, laparoscopic adjustable gastric banding; NR, not recorded; NSF, nonstone formers; RYGB, Roux-en-Y gastric bypass; SG, sleeve gastrectomy.