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Primary hyperparathyroidism with normal serum intact parathyroid hormone levels
C Mischis-Troussard1, P Goudet, B Verges
1Department of Rheumatology, Dijon University Hospital, Dijon, France.
QJM : Monthly Journal of the Association of Physicians
|June 29, 2000
Summary
Primary hyperparathyroidism (HPT) can occur with normal intact parathyroid hormone (iPTH) levels. Physicians should consider HPT in hypercalcemic patients even with normal iPTH and phosphorus, utilizing cervical imaging for diagnosis.
Area of Science:
- Endocrinology
- Nephrology
- Oncology
Background:
- Primary hyperparathyroidism (HPT) is a common endocrine disorder.
- Diagnosis typically relies on elevated serum intact parathyroid hormone (iPTH) and calcium levels.
- Normal iPTH levels can complicate HPT diagnosis.
Purpose of the Study:
- To evaluate the clinical features and diagnostic challenges of primary HPT in patients with normal serum iPTH levels.
- To assess the utility of imaging modalities in diagnosing HPT when iPTH is within the normal range.
Main Methods:
- Retrospective analysis of 271 consecutive patients undergoing surgery for primary HPT.
- Detailed review of clinical features, serum calcium, phosphorus, and iPTH levels.
- Evaluation of diagnostic accuracy of cervical ultrasound and Tc sestamibi scintigraphy.
Main Results:
- Twenty patients (7.4%) presented with normal serum iPTH levels (10-65 ng/l).
- Common symptoms included fatigue, polyuria, renal stones, and hypertension.
- Cervical ultrasound and Tc sestamibi scintigraphy successfully identified parathyroid adenomas in affected patients.
- Normal iPTH values delayed diagnosis in eight patients.
Conclusions:
- Primary HPT should be considered in hypercalcemic patients even with normal serum iPTH and phosphorus levels.
- Cervical imaging is valuable for diagnosing HPT when iPTH is within the normal range, especially below the upper limit.
- Prompt diagnosis and surgical intervention can benefit symptomatic patients.