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Calcium is not only the most abundant mineral in bone but also the most abundant mineral in the human body. Calcium ions are needed for bone mineralization, tooth health, heart rate regulation and strength of contraction, blood coagulation, the contraction of smooth and skeletal muscle cells, and the regulation of nerve impulse conduction. The average calcium level in the blood is about 10 mg/dL. When the body cannot maintain this level, a person will experience hypo or hypercalcemia.
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The endocrine system produces and secretes hormones, which interact with the skeletal system. These hormones control bone growth, maintain bone once it is formed, and remodel it.
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The thyroid hormone (TH) plays a pivotal role in the intricate orchestration of physiological processes, exerting profound effects on development, metabolism, and homeostasis throughout different life stages.
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Normocalcemia and Normal Thyroid Function in a Severe Vitamin D-Deficient Population.

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Vitamin D deficiency (VDD) was common in the study population. VDD did not significantly alter thyroid function or calcium levels within reference ranges, suggesting current vitamin D guidelines may need revision.

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Area of Science:

  • Endocrinology
  • Nutritional Science
  • Clinical Chemistry

Background:

  • Vitamin D plays roles beyond calcium homeostasis.
  • The relationship between vitamin D deficiency and hypothyroidism is debated.
  • This study investigates thyroid and calcium status in vitamin D-deficient individuals.

Purpose of the Study:

  • To determine if vitamin D deficiency is associated with thyroid dysfunction or calcium imbalance.
  • To analyze the correlation between vitamin D levels and thyroid hormones (T4, TSH) and calcium.

Main Methods:

  • Collected clinical data from 772 individuals over one year.
  • Measured serum levels of T4, TSH, calcium, and vitamin D.
  • Grouped subjects into vitamin D deficiency, insufficiency, and sufficiency categories.

Main Results:

  • 74.2% of participants had vitamin D deficiency or insufficiency.
  • No significant differences in calcium levels were found across groups.
  • Thyroid hormone levels remained within reference ranges, with T4 increasing and TSH decreasing nonsignificantly as vitamin D levels rose.

Conclusions:

  • Vitamin D deficiency did not lead to clinically significant hypothyroidism or hypocalcemia in this cohort.
  • Observed discrepancies may indicate a need to re-evaluate current vitamin D reference intervals.