Pharmacokinetics of Oral Calcium Carbonate in Parturients

Inclusion Criteria: * Pregnant female subjects at the study institution, admitted for labor (spontaneous, augmented, or induced) Exclusion Criteria: 1. severe range blood pressure (BP \>160/\>110) within the 48 hours prior to delivery 2. patient age \<18 years or \>45 years 3. renal dysfunction with a documented serum Cr \> 1.0 mg/dL 4. known history of congenital or acquired cardiac disease or history of arrhythmia 5. patient taking digoxin 6. patient currently taking a calcium channel blocker 7. Weight \<55kg or \>100kg, or 8. receiving magnesium infusion within 24 hours prior to or durin…