Table 3.
Electrolyte and laboratory values pre- and immediately posthemodialysis
| Laboratory Parameter | Prehemodialysis Value, Mean (SEM), N Subjects, N Hemodialysis Sessions | Posthemodialysis Value, Mean (SEM), N Subjects, N Hemodialysis Sessions | Delta (Posthemodialysis Minus Pre hemodialysis), Mean (SEM), N Subjects, N Hemodialysis Sessions | P value (Post vs Prehemodialysis) | Lower Limit Normal | Frequency of Posthemodialysis Concentrations Below the Lower Limit Normal, N Subjects, N Hemodialysis Sessions (%) | Upper Limit Normal | Frequency 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/L | 38 (57.6) | >145 mEq/L | 2 (3.0) |
| 66 | 66 | 66 | 311 (18.5) | 2 (0.1) | ||||
| 1708 | 1685 | 1648 | ||||||
| Potassium (mEq/L) | 4.9 (0.1) | 3.6 (0.1) | −1.2 (0.1) | <0.001 | <3.5 mEq/L | 59 (89.4) | >5.0 mEq/L | 21 (31.8) |
| 66 | 66 | 66 | 669 (39.6) | 48 (2.8) | ||||
| 1699 | 1689 | 1645 | ||||||
| Bicarbonate (mEq/L) | 22.3 (0.4) | 27.1 (0.4) | 4.9 (0.3) | <0.001 | <22 mEq/L | 28 (42.4) | >28 mEq/L | 58 (87.9) |
| 66 | 66 | 66 | 141 (8.3) | 569 (33.7) | ||||
| 1707 | 1690 | 1651 | ||||||
| Calcium (mg/dl) | 8.7 (0.1) | 9.4 (0.1) | 0.7 (0.1) | <0.001 | <8.5 mg/dL | 28 (42.4) | >10.4 mg/dl | 29 (43.9) |
| 66 | 66 | 66 | 192 (11.4) | 190 (11.3) | ||||
| 1708 | 1685 | 1648 | ||||||
| Magnesium (mg/dl) | 2.4 (0.1) | 2.1 (0.1) | −0.3 (0.03) | <0.001 | <1.7 mg/dL | 29 (43.9) | >2.4 mg/dl | 18 (27.3) |
| 66 | 66 | 66 | 162 (9.6) | 286 (16.9) | ||||
| 1708 | 1690 | 1653 | ||||||
| Phosphate (mg/dl) | 5.2 (0.2) | 2.2 (0.1) | −3.0 (0.2) | <0.001 | <2.5 mg/dL | 65 (98.5) | >4.5 mg/dl | 8 (12.1) |
| 66 | 66 | 66 | 1129 (67.1) | 8 (0.5) | ||||
| 1706 | 1682 | 1645 | ||||||
| BUN (mg/dl) | 56.2 (1.6) | 16.2 (0.6) | −39.9 (1.2) | <0.001 | — | — | — | — |
| 66 | 66 | 66 | ||||||
| 1713 | 1695 | 1657 | ||||||
| Creatinine (mg/dl) | 9.8 (0.4) | 3.5 (0.2) | −6.3 (0.3) | <0.001 | — | — | — | — |
| 66 | 66 | 66 | ||||||
| 1713 | 1695 | 1657 | ||||||
| Albumin (g/dl) | 3.9 (0.04) | 4.3 (0.1) | 0.4 (0.03) | <0.001 | — | — | — | — |
| 66 | 66 | 66 | ||||||
| 1708 | 1691 | 1654 |
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 nmeasurement outside of limits of normal/Ntotal measurements. HD, hemodialysis.