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Related Experiment Videos

Osteocalcin 24-hour profiles during normal pregnancy.

R Karlsson1, S Edén, L Eriksson

  • 1Department of Family Medicine, University of Umeå, Sweden.

Gynecologic and Obstetric Investigation
|January 1, 1992
PubMed
Summary

Osteocalcin serum levels fluctuate daily in nonpregnant women. During pregnancy and lactation, osteocalcin levels significantly decrease, suggesting reduced bone turnover.

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Area of Science:

  • Endocrinology
  • Bone Metabolism
  • Reproductive Physiology

Background:

  • Serum osteocalcin levels in nonpregnant women exhibit significant circadian variation.
  • Understanding osteocalcin dynamics during pregnancy is crucial for interpreting bone turnover markers.

Purpose of the Study:

  • To investigate the diurnal variation and concentration of serum osteocalcin throughout pregnancy and lactation.
  • To assess the impact of pregnancy and lactation on osteocalcin levels and bone turnover.

Main Methods:

  • Serum osteocalcin concentrations were measured over 24-hour periods in 12 women.
  • Participants included nonpregnant, pregnant (early, mid, and late gestation), and lactating women.

Main Results:

  • Nonpregnant women showed diurnal fluctuations (0.5-4.0 ng/ml).
  • Early pregnancy showed fluctuations, but levels decreased with minor variation in mid-pregnancy.
  • Late pregnancy and lactation revealed extremely low, stable osteocalcin levels (0.2-0.8 ng/ml), often below detection limits.

Conclusions:

  • Pregnancy and lactation are associated with significantly reduced serum osteocalcin levels.
  • The decrease in osteocalcin suggests a potential reduction in bone turnover during these physiological states.
  • Altered estrogen and growth hormone secretion may mediate these changes in bone metabolism.

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