Gestational Hypercalcemia: A Narrative Review of Literature
This narrative review examines calcium homeostasis in pregnancy and diagnostic challenges. It highlights therapeutic pitfalls and rare but life-threatening complications.
Gestational hypercalcemia represents a rare yet potentially life-threatening condition that requires careful clinical attention during pregnancy. The presentation is often nonspecific, frequently mimicking common pregnancy-related symptoms which can contribute to missed or delayed diagnosis. This lack of specificity complicates early identification and appropriate management in laboratory and metabolic research contexts.
The authors conducted a narrative literature review focusing on calcium homeostasis mechanisms within the pregnant state. By synthesizing existing medical literature, this paper aims to clarify diagnostic and therapeutic challenges associated with gestational hypercalcemia. The methodology involved a comprehensive examination of published case studies and clinical guidelines regarding maternal calcium regulation.
Key findings indicate that over 90% of gestational hypercalcemia cases are attributed to primary hyperparathyroidism (PHPT), predominantly caused by a single parathyroid adenoma. However, PTH-independent disorders also exist, including pseudohyperparathyroidism, malignancy, and excessive calcium intake. Common morbidities include nephrolithiasis and pancreatitis in the mother, alongside adverse obstetrical outcomes such as fetal loss, growth restriction, preeclampsia, and preterm delivery.
Severe cases may result in neonatal hypocalcemia due to fetal hypoparathyroidism, potentially leading to tetany or death. Hypercalciuria is a frequent laboratory finding in the presence of maternal hypercalcemia, though only familial hypocalciuric hypercalcemia (FHH) typically presents with low urinary calcium excretion. Marked sarcoidosis-associated hypercalciuria during pregnancy is attributed to increased renal and ectopic calcitriol production.
Despite these significant risks, few guidelines currently exist for the management of gestational hypercalcemia. The review emphasizes the necessity of an interdisciplinary approach to address both maternal and fetal complications. Researchers must consider various etiologies beyond PHPT when evaluating cases of unknown cause, as extended laboratory work-up remains the most useful paraclinical examination in such scenarios.