The concentration of free calcium ions and total calcium in pregnancies at term.
The concentration of free calcium ions (cCa2+), total calcium (ctCa) and pH was measured in 46 normal pregnancies at term. Measured with a combined Ca2+-pH electrode system in whole blood, maternal plasma cCa2+ was 1.18 +/- 0.03 mmol/l, and the corresponding plasma pH was 7.37 +/- 0.05 (mean +/- SD). In the cord vein, plasma cCa2+ was 1.44 +/- 0.07 mmol/l and pH 7.37 +/- 0.05. In the cord artery, plasma cCa2+ was 1.47 +/- 0.07 mmol/l and pH 7.29 +/- 0.07.
D002118:Calcium / Q000097:blood*; D004566:Electrodes; D005260:Female; D005312:Fetal Blood / Q000032:analysis; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007231:Infant, Newborn; D008431:Maternal-Fetal Exchange; D011247:Pregnancy; D011263:Pregnancy Trimester, Third
D002118:Calcium