Table 1.
Solute concentrations and osmolalities (mean ± SE) 5 d after fetal catheterization
| Maternal plasma | Fetal plasma | Amniotic fluid | Fetal urine | |
| Sodium (mmol/L) | 144.8 ± 0.5 | 137.9 ± 0.6 | 111.9 ± 2.5 | 45.8 ± 3.6 |
| Potassium (mmol/L) | 4.13 ± 0.05 | 4.27 ± 0.09 | 8.29 ± 0.79 | 9.14 ± 1.27 |
| Chloride (mmol/L) | 110.8 ± 0.6 | 103.0 ± 0.7 | 87.8 ± 2.1 | 17.0 ± 2.2 |
| Calcium (mmol/L) | 0.95 ± 0.08 | 1.43 ± 0.02 | 1.01 ± 0.12 | 0.29 ± 0.04 |
| Bicarbonate (mmol/L) | 25.9 ± 0.5 | 28.0 ± 0.4 | 13.8 ± 1.0 | 6.5 ± 0.9 |
| Glucose (mmol/L) | 3.9 ± 0.1 | 1.17 ± 0.05 | 0.92 ± 0.21 | 0.28 ± 0.03 |
| Lactate (mmol/L) | 1.0 ± 0.1 | 1.35 ± 0.05 | 1.35 ± 0.21 | 0.33 ± 0.02 |
| Osmolality (mOsm/kg water) | 299.2 ± 1.3 | 297.0 ± 1.0 | 268.1 ± 2.9 | 159.4 ± 7.4 |
Because there were no statistically significant differences in fetal or amniotic fluid composition between control, amnion-resected, and amniochorion-resected fetuses, data were combined (n = 25).