Normocalcemic Primary Hyperparathyroidism: Need for a Standardized Clinical Approach

Area of Science:

• Endocrinology
• Metabolic Disorders
• Clinical Medicine

Background:

• Normocalcemic primary hyperparathyroidism (NHPT) lacks clear diagnostic guidelines and management strategies since its 2008 definition.
• Recent research indicates frequent serum calcium fluctuations challenge traditional NHPT diagnostic criteria.
• Debate exists on classifying calcium variations as NHPT or milder primary hyperparathyroidism.

Purpose of the Study:

• To review the clinical aspects of normocalcemic primary hyperparathyroidism (NHPT).
• To discuss diagnostic challenges and proposed innovative definitions for NHPT.
• To explore potential non-classical complications and associations of NHPT.

Main Methods:

• Literature review focusing on clinical studies and observational data.
• Analysis of recent research on NHPT prevalence, diagnosis, and complications.
• Synthesis of findings regarding parathyroid hormone (PTH) associations with comorbidities.

Main Results:

• NHPT diagnosis is complicated by intermittent serum calcium oscillations near normal limits.
• Cardiovascular complications are increasingly associated with NHPT, suggesting a role in cardiovascular risk.
• Observational studies link elevated PTH to comorbidities, potentially independent of serum calcium levels.

Conclusions:

• Definitive conclusions on NHPT's role in non-classical complications are hindered by heterogeneous study definitions.
• Further prospective studies are needed to validate novel NHPT diagnostic approaches.
• This review aims to provide a clinical perspective and suggest an approach to managing NHPT.