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01-12-2020 | Original Article

Seasonal periodicity of serum parathyroid hormone and its relation with vitamin D in Romania

Authors: Dan Alexandru Niculescu, Laura Georgiana Deacu, Andra Caragheorgheopol, Roxana Dusceac, Camelia Procopiuc, Rodica Petris, Catalina Poiana

Published in: Archives of Osteoporosis | Issue 1/2020

Abstract

Summary

We measured serum parathyroid hormone in 8409 Romanian subjects and found a mild seasonal variation with highest levels in March and lowest levels in September. PTH was dependent on serum vitamin D, particularly below 12.82 ng/mL. Together, these suggest that vitamin D supplementation is warranted only in at-risk groups.

Purpose

Seasonal variation of parathyroid hormone (PTH) and its dependency on serum 25-hydroxy vitamin D (25(OH)D) levels are well-described. However, there are few studies from Europe, and genetic, nutritional, and cultural differences are important. We describe the seasonal variation of serum PTH and its relation with serum 25(OH)D levels in Romania.

Methods

We retrieved from our endocrinology center database all PTH measurements between 2011 and 2019 together with age, sex, diagnosis, and date of blood sampling. Simultaneous serum 25(OH)D levels were partially available. Intact PTH was measured using the same electrochemiluminescence assay.

Results

There were 8409 subjects (median age 49 (36, 60) years; 20.5% men) without a diagnosis of hyperparathyroidism (primary or secondary to chronic kidney disease), hypoparathyroidism, or low bone mass. Serum PTH showed a mild seasonal variation with highest levels at the end of March (47.61 pg/mL) and lowest levels at the end of September (43.15 pg/mL). All sex and age subgroups showed highest levels in the spring and lowest levels in the fall. Males had significantly lower PTH levels than females irrespective of season. PTH correlated inversely with serum 25(OH)D with a breakpoint of 12.82 ng/mL in 2800 subjects who had a simultaneous measurement of 25(OH)D. Increasing age was associated with increasing PTH levels independently of serum 25(OH)D.

Conclusions

We showed a mild seasonal variation of serum PTH in Romania, at an inverse sinusoidal pattern than serum 25(OH)D. The breakpoint on the PTH–25(OH)D correlation suggests that vitamin D supplementation is warranted only in at-risk groups.

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Title: Seasonal periodicity of serum parathyroid hormone and its relation with vitamin D in Romania
Authors: Dan Alexandru Niculescu
Laura Georgiana Deacu
Andra Caragheorgheopol
Roxana Dusceac
Camelia Procopiuc
Rodica Petris
Catalina Poiana
Publication date: 01-12-2020
Publisher: Springer London
Published in: Archives of Osteoporosis / Issue 1/2020
Print ISSN: 1862-3522
Electronic ISSN: 1862-3514
DOI: https://doi.org/10.1007/s11657-020-00744-1

At a glance: The STEP trials

Springer Medicine

Seasonal periodicity of serum parathyroid hormone and its relation with vitamin D in Romania

Abstract

Summary

Purpose

Methods

Results

Conclusions

At a glance: The STEP trials

Springer Medicine

Abstract

Summary

Purpose

Methods

Results

Conclusions

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