Within-centre evaluation of hypercalcaemia discriminant functions 5 years after their development

Area of Science:

• Clinical Chemistry
• Diagnostic Medicine
• Endocrinology

Background:

• Hypercalcaemia is a common electrolyte disturbance with diverse causes.
• Accurate discrimination between clinically significant and non-significant hypercalcaemia is crucial for appropriate patient management.
• Discriminant functions were previously developed to aid in this diagnostic process.

Purpose of the Study:

• To evaluate the long-term diagnostic performance of established hypercalcaemia discriminant functions.
• To assess the impact of a five-year time interval on the diagnostic capacity of these functions.

Main Methods:

• Two distinct patient cohorts with hypercalcaemia were consecutively recorded, separated by a five-year interval.
• Demographic data, including prevalence and female/male ratio, were compared between the two populations.
• The accuracy of the pre-existing discriminant functions in classifying hypercalcaemia was assessed for both cohorts.

Main Results:

• The prevalence of hypercalcaemia (2.57% vs. 2.38%) and the female/male ratio (1.9 vs. 1.7) were comparable between the two study periods.
• Discriminant functions demonstrated sustained diagnostic capacity, correctly classifying 81% and 80% of women in the first and second populations, respectively.
• Classification accuracy for men was 75% in the first population and 64% in the second population.

Conclusions:

• Diagnostic discriminant functions for hypercalcaemia retain significant clinical utility five years after their initial development.
• While performance in women remained stable, a slight decrease in accuracy was observed for men in the later cohort.
• These findings support the continued use of these discriminant functions in the diagnostic evaluation of hypercalcaemia.