Table 3.

Electrolyte and laboratory values pre- and immediately posthemodialysis

Laboratory ParameterPrehemodialysis Value, Mean (SEM), N Subjects, N Hemodialysis SessionsPosthemodialysis Value, Mean (SEM), N Subjects, N Hemodialysis SessionsDelta (Posthemodialysis Minus Pre hemodialysis), Mean (SEM), N Subjects, N Hemodialysis SessionsP value (Post vs Prehemodialysis)Lower Limit NormalFrequency of Posthemodialysis Concentrations Below the Lower Limit Normal, N Subjects, N Hemodialysis Sessions (%)Upper Limit NormalFrequency of Posthemodialysis Concentrations Above the Upper Limit Normal, N Subjects, N Hemodialysis Sessions (%)
Sodium (mEq/L)136.9 (0.5)137.3 (0.3)0.5 (0.4)0.20<135 mEq/L38 (57.6)>145 mEq/L2 (3.0)
666666311 (18.5)2 (0.1)
170816851648
Potassium (mEq/L)4.9 (0.1)3.6 (0.1)−1.2 (0.1)<0.001<3.5 mEq/L59 (89.4)>5.0 mEq/L21 (31.8)
666666669 (39.6)48 (2.8)
169916891645
Bicarbonate (mEq/L)22.3 (0.4)27.1 (0.4)4.9 (0.3)<0.001<22 mEq/L28 (42.4)>28 mEq/L58 (87.9)
666666141 (8.3)569 (33.7)
170716901651
Calcium (mg/dl)8.7 (0.1)9.4 (0.1)0.7 (0.1)<0.001<8.5 mg/dL28 (42.4)>10.4 mg/dl29 (43.9)
666666192 (11.4)190 (11.3)
170816851648
Magnesium (mg/dl)2.4 (0.1)2.1 (0.1)−0.3 (0.03)<0.001<1.7 mg/dL29 (43.9)>2.4 mg/dl18 (27.3)
666666162 (9.6)286 (16.9)
170816901653
Phosphate (mg/dl)5.2 (0.2)2.2 (0.1)−3.0 (0.2)<0.001<2.5 mg/dL65 (98.5)>4.5 mg/dl8 (12.1)
6666661129 (67.1)8 (0.5)
170616821645
BUN (mg/dl)56.2 (1.6)16.2 (0.6)−39.9 (1.2)<0.001
666666
171316951657
Creatinine (mg/dl)9.8 (0.4)3.5 (0.2)−6.3 (0.3)<0.001
666666
171316951657
Albumin (g/dl)3.9 (0.04)4.3 (0.1)0.4 (0.03)<0.001
666666
170816911654
  • Mean differences (delta) were calculated using data from subjects who had both pre- and postmeasurement for each given electrolyte. Percent of sessions with a value above or below the limits of normal are calculated as n measurement outside of limits of normal/N total measurements. HD, hemodialysis.