Page last updated October 2018

This is a FREE resource designed to support the medical profession in their care of women made possible by over 750 expert clinicians who are generously providing their contributions without any remuneration and by the publishers who have paid personally for the creation of this site in the memory of their daughter, Abigail.

Current Authors

Calcium

Calcium is used by the body to assist in:
  • Blood clotting
  • Muscle contractions
  • Nerve impulse conduction

Most (98%) of the body's calcium is stored in the teeth and bones. In the blood, about half the calcium is bound to plasma proteins, and about half is free (ionized, Ca++).

Calcium levels may rise in the presence of:

  • Cancer
  • Acidosis
  • Hyperthyroidism
  • Hyperparathyroidism
  • Bedrest
  • Calcium supplements
  • Excessive vitamin D intake

Calcium levels may fall in the presence of:

  • Decreased plasma proteins 
  • Alkalosis
  • Diarrhea
  • Vitamin C deficiency

Normal Values*

Men 8.8–10.0 mg/dL 2.152.55 mmol/L
Women 9.010.5 mg/dL 2.152.55 mmol/L
Pregnancy 8.19.5 mg/dL 2.022.40 mmol/L
Children 9.211.0 mg/dL 2.302.75 mmol/L

*These are general values taken from a variety of sources. The actual normal values may vary from lab to lab and from one type of testing protocol to another.