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Variations in parathyroid hormone concentration in patients with low 25 hydroxyvitamin D

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Abstract

Summary

Although 25 hydroxyvitamin D (25OHD) and parathyroid hormone (PTH) levels are inversely related, less than half of the patients with a low vitamin D level have an elevated PTH, and, in most of these patients, the PTH does not immediately normalize with correction of the vitamin D.

Introduction

Despite the inverse relationship between 25OHD and PTH, patients with vitamin D deficiency seen in clinical practice do not always have an elevated PTH, and, in those with secondary hyperparathyroidism, the PTH does not always normalize with correction of vitamin D deficiency. We examined variations in PTH concentrations in patients with low 25OHD and studied changes in the PTH concentration with restoration of vitamin D sufficiency.

Methods

This was a retrospective cohort study of patients with a 25OHD < 30 ng/mL and a concomitant PTH measurement seen at the Metabolic Bone Disease Clinic at a tertiary care center between July 1, 2007 and May 31, 2011. Patients with conditions associated with alterations in PTH were excluded.

Results

The study population consisted of 104 patients. The mean age was 55.5 years, and 83 % were female. The 25OHD and PTH were negatively correlated, but only 30 % of patients with a 25OHD < 30 ng/mL and 40 % of those with a 25OHD < 20 ng/mL had an elevated PTH. As the 25OHD increased to 30 ng/mL or higher, the PTH decreased significantly in the group of patients who had an elevated PTH at baseline, but only 44 % reached a normal PTH. Of patients with a normal PTH at baseline, 59 % experienced a drop in their PTH while the PTH remained unchanged or increased in 41 %.

Conclusions

PTH has a limited role in defining vitamin D status in individual patients and in guiding vitamin D therapy in clinical practice.

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Abbreviations

25OHD:

25 Hydroxyvitamin D

ASR:

Amal Shibli-Rahhal

BP:

Bhanu Paturi

EMR:

Electronic medical record

PTH:

Parathyroid hormone

SAS:

Statistical analysis system

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Correspondence to A. Shibli-Rahhal.

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Shibli-Rahhal, A., Paturi, B. Variations in parathyroid hormone concentration in patients with low 25 hydroxyvitamin D. Osteoporos Int 25, 1931–1936 (2014). https://doi.org/10.1007/s00198-014-2687-4

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  • DOI: https://doi.org/10.1007/s00198-014-2687-4

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