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Related Concept Videos

The Parathyroid Glands00:59

The Parathyroid Glands

The two pairs of parathyroid glands embedded within the posterior surface of the thyroid gland are restricted by a dense capsule around them. These glands comprise two distinct cell populations—parathyroid oxyphil and parathyroid principal cells- pivotal in calcium homeostasis.
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Hypothyroidism is a disorder characterized by insufficient production of thyroid hormones, which regulate metabolism, energy balance, and multiple organ systems.TypesHypothyroidism is classified based on the level of dysfunction. Primary hypothyroidism results from intrinsic thyroid gland dysfunction, causing reduced hormone production despite normal or increased stimulation. Secondary hypothyroidism arises from inadequate thyroid-stimulating hormone (TSH) secretion by the pituitary. Tertiary...
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Skeleton and Calcium Homeostasis01:21

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Synthesis and Functions of Calcitonin00:51

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Updated: May 14, 2026

Two Techniques to Create Hypoparathyroid Mice: Parathyroidectomy Using GFP Glands and Diphtheria-Toxin-Mediated Parathyroid Ablation
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Differentiating familial hypocalciuric hypercalcemia from primary hyperparathyroidism.

Myrick C Shinall1, Kathryn McCrystal Dahir, James T Broome

  • 1Division of Surgical Oncology and Endocrine Surgery, Vanderbilt University Medical Center, Nashville, Tennessee 37232, USA. ricky.shinall@vanderbilt.edu

Endocrine Practice : Official Journal of the American College of Endocrinology and the American Association of Clinical Endocrinologists
|February 22, 2013
PubMed
Summary

Familial hypocalciuric hypercalcemia (FHH) and primary hyperparathyroidism (PHPT) are often misdiagnosed due to similar symptoms. Genetic testing is crucial for accurately differentiating FHH from PHPT, preventing unnecessary surgery.

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Two Techniques to Create Hypoparathyroid Mice: Parathyroidectomy Using GFP Glands and Diphtheria-Toxin-Mediated Parathyroid Ablation
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Area of Science:

  • Endocrinology
  • Genetics
  • Nephrology

Background:

  • Familial hypocalciuric hypercalcemia (FHH) and primary hyperparathyroidism (PHPT) present overlapping clinical features, leading to diagnostic challenges.
  • Both conditions can manifest as hypercalcemia with abnormal parathyroid hormone levels, complicating differentiation.
  • Understanding the distinct renal calcium handling in FHH versus PHPT is key.

Purpose of the Study:

  • To review the clinical and biochemical methods for differentiating FHH from PHPT.
  • To highlight the diagnostic limitations of current biochemical tests.
  • To emphasize the role of genetic testing in definitive FHH diagnosis.

Main Methods:

  • Comprehensive review of English-language literature on FHH and PHPT.
  • Analysis of diagnostic criteria and proposed differentiation indices.
  • Examination of genetic factors, specifically calcium-sensing receptor (CaSR) gene mutations.

Main Results:

  • FHH is a rare genetic disorder often presenting as asymptomatic hypercalcemia.
  • The calcium:creatinine clearance ratio (CCCR) is a widely used but imperfect biochemical marker.
  • Significant overlap exists in biochemical indices, making differentiation challenging.
  • Calcium-sensing receptor (CaSR) gene mutations are associated with FHH and exhibit functional variability.

Conclusions:

  • The calcium:creatinine clearance ratio (CCCR) is the consensus biochemical test but has an indeterminate range.
  • Definitive diagnosis of FHH necessitates genetic testing.
  • A combined approach of clinical suspicion, biochemical testing, and genetic analysis is essential to distinguish PHPT from FHH and avoid inappropriate surgery for FHH patients.