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Parathyroid stimulation after bleeding in man.

J Foldes1, P Wilson, S M Saeed

  • 1Division of Bone and Mineral, Henry Ford Hospital, Detroit, Michigan.

Acta Endocrinologica
|August 1, 1992
PubMed
Summary
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Moderate blood loss in humans triggers a physiological rise in parathyroid hormone (PTH) and calcium levels. This response is vital for bone marrow adaptation following bleeding.

Area of Science:

  • Endocrinology
  • Hematology
  • Physiology

Background:

  • The parathyroid hormone (PTH)-calcium axis is implicated in bone marrow responses to bleeding.
  • Previous studies in rats suggested a role for this axis in erythropoiesis regulation.

Purpose of the Study:

  • To investigate the physiological changes in serum parathyroid hormone (PTH) and calcium levels in humans following moderate blood donation.
  • To explore the relationship between these hormonal changes and markers of erythropoiesis.

Main Methods:

  • A human bleeding model was established using 20 autologous blood donors, each donating two units of blood.
  • Serum intact PTH and protein-corrected total calcium levels were measured before and after blood donation.
  • Correlation analysis was performed between PTH, calcium, and reticulocyte count.

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Main Results:

  • A significant increase in serum intact PTH was observed post-donation (p = 0.0003).
  • A non-significant increase in protein-corrected total calcium was noted (p = 0.2).
  • PTH showed a weak correlation with reticulocyte count, but not with corrected serum calcium.

Conclusions:

  • Moderate bleeding in humans elicits a physiological increase in serum PTH and calcium.
  • These findings support the role of the PTH-calcium axis in the body's response to acute blood loss.