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Serum calcium concentrations in human pregnancy
American Journal of Obstetrics and Gynecology
|April 1, 1977
Summary
Maternal serum total calcium decreases during pregnancy, primarily due to a drop in albumin-bound calcium, not free calcium ions. This ensures stable calcium ion levels essential for fetal development.
Area of Science:
- Biochemistry
- Physiology
- Obstetrics
Background:
- Maternal serum calcium levels undergo significant physiological changes during pregnancy.
- Understanding these changes is crucial for monitoring maternal and fetal health.
Purpose of the Study:
- To investigate the distinct patterns of total and ionic calcium concentrations in maternal serum throughout pregnancy.
- To determine the contribution of different calcium fractions to the overall decline observed during gestation.
Main Methods:
- Cross-sectional study measuring total and ionic calcium in nonpregnant, pregnant, and early puerperal women.
- Atomic absorption spectrophotometry for total calcium determination.
- Calcium flow-through electrode for ionic calcium measurement.
Main Results:
- Total serum calcium significantly declined from the first trimester to term.
- Ionic calcium also decreased, but to a lesser extent than total calcium.
- The proportion of ionic calcium increased as total calcium decreased, indicating changes in the non-ionized fraction.
Conclusions:
- The decline in maternal serum total calcium during pregnancy is mainly attributed to a reduction in the non-ionized (albumin-bound) fraction.
- Serum ionic calcium concentration remains remarkably stable, crucial for physiological homeostasis.
- Pregnancy-induced alterations in calcium binding, rather than free calcium availability, characterize these changes.