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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.
Oxyphil cells, whose functions remain elusive, emerge during late puberty, adding a layer of complexity to the parathyroid gland's intricacies. In contrast, principal parathyroid cells undertake a vital role by producing...
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Hyperthyroidism II: Pathophysiology

Hyperthyroidism is a hypermetabolic state caused by elevated levels of thyroid hormones, triiodothyronine (T3) and thyroxine (T4). It results from dysregulation at the thyroid, pituitary, or immune system level and affects multiple organ systems.PathophysiologyThe most common cause of hyperthyroidism is Graves’ disease, an autoimmune disorder in which antibodies, specifically thyroid-stimulating antibodies (TSAb), a subtype of TSH receptor antibodies (TRAb), bind to and activate TSH receptors...
Skeleton and Calcium Homeostasis01:21

Skeleton and Calcium Homeostasis

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.
Bone Remodeling01:40

Bone Remodeling

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Synthesis and Functions of Calcitonin00:51

Synthesis and Functions of Calcitonin

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Hypothyroidism II: Pathophysiology

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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Normocalcemic primary hyperparathyroidism: a common disease in search of common standards.

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Related Experiment Video

Updated: Jul 10, 2026

Generation of Hypoparathyroid Rats via Carbon-Nanoparticle-Assisted Parathyroidectomy
03:57

Generation of Hypoparathyroid Rats via Carbon-Nanoparticle-Assisted Parathyroidectomy

Published on: July 14, 2023

Normocalcemic Primary Hyperparathyroidism: An Evolving Understanding.

Salina A Kalik1, Ejigayehu G Abate2, Natalie E Cusano1

  • 1Division of Endocrinology, Department of Medicine, Lenox Hill Hospital, Zucker School of Medicine at Hofstra/Northwell, New York, NY, 10022.

Endocrine Practice : Official Journal of the American College of Endocrinology and the American Association of Clinical Endocrinologists
|July 8, 2026
PubMed
Summary
This summary is machine-generated.

Normocalcemic primary hyperparathyroidism (NPHPT) involves high parathyroid hormone (PTH) with normal calcium. This review aids clinicians in diagnosing and managing NPHPT, a condition with poorly understood causes and challenging treatment.

Keywords:
diagnosishyperparathyroidismnormocalcemic primary hyperparathyroidismprimary hyperparathyroidismtreatment

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Establishment of a Simple and Effective Rat Model for Intraoperative Parathyroid Gland Imaging
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Two Techniques to Create Hypoparathyroid Mice: Parathyroidectomy Using GFP Glands and Diphtheria-Toxin-Mediated Parathyroid Ablation

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Last Updated: Jul 10, 2026

Generation of Hypoparathyroid Rats via Carbon-Nanoparticle-Assisted Parathyroidectomy
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Generation of Hypoparathyroid Rats via Carbon-Nanoparticle-Assisted Parathyroidectomy

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Establishment of a Simple and Effective Rat Model for Intraoperative Parathyroid Gland Imaging
07:12

Establishment of a Simple and Effective Rat Model for Intraoperative Parathyroid Gland Imaging

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

Published on: March 14, 2017

Area of Science:

  • Endocrinology
  • Metabolic Bone Disease

Background:

  • Normocalcemic primary hyperparathyroidism (NPHPT) is a distinct endocrine disorder.
  • It is characterized by elevated parathyroid hormone (PTH) levels and normal serum calcium.
  • Pathophysiology and long-term outcomes remain poorly understood.

Purpose of the Study:

  • To review the current literature on NPHPT.
  • To inform clinical decision-making for diagnosis and management.
  • To highlight challenges in NPHPT patient care.

Main Methods:

  • Literature synthesis of existing research on NPHPT.
  • Review of diagnostic criteria and exclusion of secondary causes.
  • Analysis of treatment outcomes, including parathyroidectomy.

Main Results:

  • NPHPT is often diagnosed in postmenopausal women with osteoporosis or nephrolithiasis.
  • Patients may have a higher burden of bone and renal disease.
  • Parathyroidectomy shows bone density benefits, but renal outcome data is limited.

Conclusions:

  • NPHPT diagnosis requires excluding secondary hyperparathyroidism.
  • Management is challenging due to limited data.
  • Further research is needed on NPHPT's long-term impact and treatment efficacy.