Preoperative PTH and ALP: Clinical Markers for Predicting Persistent Postoperative Hypocalcemia, Suggests Study
A recent retrospective observational cohort study published in the Indian Journal of Surgery in May 2026 reveals that nearly one-third of Indian patients develop hungry bone syndrome following surgery for primary hyperparathyroidism, identifying preoperative PTH and ALP levels as essential clinical markers for predicting persistent postoperative hypocalcemia.
While Hungry Bone Syndrome (HBS) remains a recognized post-surgical complication that extends hospital stays and increases morbidity, existing predictive markers are often inconsistent, leaving a significant clinical gap in regions like India where vitamin D deficiency and advanced skeletal disease are prevalent. Consequently, Surjeet Dwivedi and colleagues from a tertiary surgical center conducted the research to evaluate biochemical predictors and refine risk stratification for patients with primary hyperparathyroidism (PHPT).
Therefore, the retrospective observational cohort study monitored twenty-five consecutive patients with biochemically confirmed PHPT between January 2023 and December 2025 at a tertiary surgical center to evaluate the relationship between preoperative variables—including serum calcium, phosphate, Parathyroid Hormone (PTH), Alkaline Phosphatase (ALP), and 25-OH vitamin D—and surgical outcomes. The researchers defined the primary endpoint, HBS, as postoperative hypocalcemia persisting for more than 72 hours after surgery that required clinically significant calcium supplementation, while specifically excluding patients who only experienced transient, asymptomatic biochemical drops.
Key Clinical Findings of the Study Include:
Strong PTH Predictive Power: Preoperative Parathyroid Hormone levels exceeding 300 pg/mL demonstrated the highest discriminatory performance, yielding a sensitivity of 83% and a specificity of 70% with an Area Under the Receiver Operating Characteristic (AUROC) curve of 0.79.
High ALP Sensitivity: Preoperative Alkaline Phosphatase levels of 200 IU/L or higher showed comparable predictive value, providing 71% sensitivity and 72% specificity for identifying at-risk patients.
Limited Calcium Utility: Interestingly, preoperative serum calcium levels were found not to be predictive of the development of the syndrome, suggesting clinicians should look toward other biochemical markers.
Directional Vitamin D Risk: While vitamin D deficiency (levels below 20 ng/mL) showed a directionally increased risk for the condition, it did not emerge as an independent significant predictor during multivariable analysis.
Effective Bedside Scoring: An exploratory three-point bedside score integrating PTH, ALP, and vitamin D effectively stratified risk, as no patient with a score of zero developed the complication.
The results suggest that nearly 28% of the Indian cohort developed hungry bone syndrome, confirming that preoperative biochemical assessment using routinely available markers can significantly improve perioperative risk stratification.
Thus, the study concludes clinicians may find that integrating these standard preoperative markers into a combined assessment provides a more reliable framework for anticipating which patients will require intensive postoperative calcium management.
Although these findings provide a valuable hypothesis-generating framework for surgical teams, the study’s exploratory nature and limited cohort size mean that validation in larger, prospective multicentric trials is necessary before these markers are fully implemented in clinical protocols.
Reference
Dwivedi, S., Dwivedi, S., Gaur, A., Kumar, S., Kumar, M., Sinha, C., Sharma, M., Dutta, A., Kahlon, P. S., & Chaudhary, S. (2026). Biochemical Predictors of Hungry Bone Syndrome in Primary Hyperparathyroidism: Evidence from an Indian Cohort. Indian Journal of Surgery.
