Electrolyte changes after bowel preparation for colonoscopy: A randomized controlled multicenter trial

Table 2 Laboratory findings before and after intake of the bowel preparation solutions

	PEG-Asc	4-L PEG	P value1
Serum
Sodium			0.161
Before, mmol/L	140.0 ± 2.4	139.8 ± 1.9
After, mmol/L	140.8 ± 2.6a	141.1 ± 2.1a
Potassium			0.005
Before, mmol/L	4.1 ± 0.3	4.2 ± 0.3
After, mmol/L	4.2 ± 0.4	4.0 ± 0.4a
Chloride			0.259
Before, mmol/L	103.4 ± 3.3	103.2 ± 2.8
After, mmol/L	105.3 ± 3.4a	103.2 ± 3.1
Magnesium			0.447
Before, mg/dL	2.2 ± 0.2	2.2 ± 0.1
After, mg/dL	2.1 ± 0.2	2.1 ± 0.2
Phosphorus			0.009
Before, mg/dL	3.4 ± 0.4	3.4 ± 0.5
After, mg/dL	3.6 ± 0.5a	3.4 ± 0.4
Calcium			0.174
Before, mg/dL	8.9 ± 0.5	8.9 ± 0.9
After, mg/dL	9.7 ± 8.1	9.0 ± 0.4
Urea			0.624
Before, mg/dL	14.0 ± 4.7	13.8 ± 3.4
After, mg/dL	13.1 ± 4.6a	12.6 ± 3.9a
Creatinine			0.172
Before, mg/dL	1.0 ± 1.1	0.8 ± 0.2
After, mg/dL	0.8 ± 0.2	0.8 ± 0.2
Serum osmolarity			0.733
Before, mmol/kg	293.1 ± 31.2	291.6 ± 8.2
After, mmol/kg	294.4 ± 57.8	291.1 ± 11.5
Urine
Urine osmolarity			0.741
Before, mmol/L	633.2 ± 222.1	639.7 ± 212.4
After, mmol/L	694.4 ± 216.1a	693.8 ± 183.7a

¹P values were calculated as interactions of preparation method and time by linear mixed model.

^aP < 0.05 vs baseline by paired t-test. Data given as mean ± SD. PEG-Asc: Low-volume (2-L) polyethylene glycol solution + ascorbic acid 4.7g; 4-L PEG: High-volume (4-L) polyethylene glycol solution.