Table 4.

Electrolyte and laboratory changes 15 and 30 minutes posthemodialysis

Laboratory Parameter	Mean (SEM), N Subjects, N Hemodialysis Sessions				P Value (Post Versus 15 Minutes Post)	Mean (SEM), N Subjects, N Hemodialysis Sessions		P Value (Post Versus 30 Minutes Post)
	Prehemodialysis	Posthemodialysis	15 min Posthemodialysis	Delta (15 Minutes Post Minus Post)		30 Minutes Posthemodialysis	Delta (30 Minutes Post Minus Post)
Sodium (mEq/L)	136.9 (0.5)	137.3 (0.3)	139.2 (0.4)	0.5 (0.3)	0.10	138.7 (0.5)	−0.1 (0.3)	0.80
	66	66	40	40		38	38
	1708	1685	40	40		38	38
Potassium (mEq/L)	4.9 (0.1)	3.6 (0.1)	3.6 (0.1)	−0.1 (0.1)	0.26	3.8 (0.1)	0.2 (0.1)	0.03
	66	66	40	40		38	38
	1699	1689	40	40		38	38
Bicarbonate (mEq/L)	22.3 (0.4)	27.1 (0.4)	27.0 (0.7)	−1.1 (0.5)	0.02	27.5 (0.5)	−0.7 (0.2)	<0.01
	66	66	40	40		38	38
	1707	1690	40	40		38	38
Calcium (mg/dl)	8.7 (0.1)	9.4 (0.1)	8.9 (0.2)	−0.6 (0.2)	<0.01	9.2 (0.1)	−0.3 (0.1)	<0.01
	66	66	40	40		38	38
	1708	1685	40	40		38	38
Magnesium (mg/dl)	2.4 (0.1)	2.1 (0.1)	1.8 (0.1)	−0.1 (0.04)	0.08	1.9 (0.04)	0.01 (0.02)	0.59
	66	66	40	40		38	38
	1708	1690	40	40		38	38
Phosphate (mg/dl)	5.2 (0.2)	2.2 (0.1)	2.4 (0.1)	0.1 (0.1)	0.03	2.6 (0.1)	0.4 (0.1)	<0.001
	66	66	39	39		38	38
	1706	1682	39	39		38	38
BUN (mg/dl)	56.2 (1.6)	16.2 (0.6)	16.9 (1.2)	0.8 (0.6)	0.19	18.9 (1.2)	2.5 (0.4)	<0.001
	66	66	24	24		38	24
	1713	1695	24	24		24	24
Creatinine (mg/dl)	9.8 (0.4)	3.5 (0.2)	4.2 (0.3)	0.2 (0.1)	0.20	4.7 (0.3)	0.6 (0.1)	<0.001
	66	66	39	39		38	38
	1713	1695	39	39		38	38
Albumin (g/dl)	3.9 (0.04)	4.3 (0.1)	4.1 (0.1)	−0.4 (0.1)	0.001	4.3 (0.1)	−0.2 (0.1)	<0.001
	66	66	40	40		38	38
	1708	1691	40	40		38	38

Mean differences (delta) were calculated using data from subjects who had both pre- and postmeasurement for each given electrolyte. The total number of sessions with laboratory data may vary due to missing collections or data recording. Percentages may not add to 100 due to rounding. HD, hemodialysis.