Table 1.

Median values of urinary and serum parameters

ParameterMO (n=30)Post-BS (n=61)P
Urine
 Volume (ml/d)1593 (1100–2100)1140 (910–1460)0.002
 Calcium (mg/d)161 (23–488)89 (21–270)<0.001
 Oxalate (mg/d)29 (22–42)26 (22–37)0.39
 Citrate (mg/d)522 (362–830)472 (307–814)0.40
 Magnesium (mg/d)77 (53–106)91 (77–139)0.01
 Uric acid (mg/d)711 (564–815)401 (345–504)<0.001
 Sodium (mEq/d)184 (122–252)141 (105–181)0.01
 Creatinine (mg/d)1424 (1092–1637)1035 (907–1222)<0.001
 Urea (g/d)17 (15–25)14 (10–17)0.003
 pH5.81 (5.31–6.17)5.78 (5.49–6.33)0.37
 Tiselius index (SSCaOx)0.92 (0.71–1.52)0.74 (0.47–1.30)0.23
Serum
 Creatinine (mg/dl)0.72 (0.60–0-85)0.69 (0.62–0.76)0.72
 Uric acid (mg/dl)5.5 (3.1–11.1)4.3 (2.2–9.1)0.002
 Albumin (mg/dl)4.2 (4.1–4.4)4.2 (4.0–4.3)0.29
 Potassium (mEq/L)4.3 (4.0–4.5)4.2 (4.0–4.4)0.49
 Ionized calcium (mmol/L)1.27 (1.25–1.29)1.25 (1.23–1.28)0.85
 Parathyroid hormone (pg/ml)58 (43–72)56 (44–69)0.46
 HCO3 (mEq/L)27 (26–30)28 (26–31)0.47
  • Data are presented as median (interquartile range). MO, morbidly obese; BS, bariatric surgery.